- A
AWS CloudTrail with log file validation enabled, and store the log files in an Amazon S3 bucket with S3 Object Lock enabled in compliance mode
This option is correct. CloudTrail records API calls, and log file validation provides integrity. S3 Object Lock in compliance mode prevents any user, including the root user, from deleting or modifying the log files for the retention period, satisfying the tamper-proof retention requirement.
- B
AWS Config with a HIPAA conformance pack, and store the configuration history in an Amazon S3 bucket with versioning enabled
Why wrong: AWS Config tracks resource configuration changes, not API calls. While versioning helps protect against accidental overwrites, it does not prevent intentional deletion by authorized users. S3 Object Lock is required for strict write-once-read-many (WORM) compliance. Additionally, the HIPAA conformance pack is for evaluating configurations against HIPAA rules, not for recording API calls.
- C
Amazon GuardDuty with findings exported to an Amazon S3 bucket, and enable MFA Delete on the bucket
Why wrong: GuardDuty is a threat detection service that identifies suspicious activity; it does not record all API calls. MFA Delete requires multi-factor authentication to delete objects but does not block deletion by the root user who holds the MFA device. It is not sufficient for a strict 7-year retention requirement.
- D
AWS CloudTrail with log file validation enabled, and store the log files in an Amazon S3 bucket with MFA Delete enabled
Why wrong: While CloudTrail with log file validation is correct for recording API calls and ensuring integrity, MFA Delete does not provide the same level of protection as S3 Object Lock in compliance mode. The root user can still delete objects because they own the MFA device. S3 Object Lock in compliance mode is the only option that prevents any user (including root) from deleting objects.
CLF-C02 Security and Compliance Practice Question
This CLF-C02 practice question tests your understanding of security and compliance. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A healthcare company is subject to HIPAA regulations and must record all AWS API calls made in its account for auditing. The logs must be retained for 7 years and must be protected from any modification or deletion, including by the account root user. Which combination of AWS services should the company use to meet these requirements?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
AWS CloudTrail with log file validation enabled, and store the log files in an Amazon S3 bucket with S3 Object Lock enabled in compliance mode
Option A is correct because AWS CloudTrail with log file validation enabled ensures the integrity of the API call logs by using a digital signature (SHA-256 hash) to detect any tampering. Storing these logs in an Amazon S3 bucket with S3 Object Lock in compliance mode prevents any user, including the root user, from overwriting or deleting the objects for the specified retention period (7 years), meeting HIPAA's immutable audit log requirements.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
AWS CloudTrail with log file validation enabled, and store the log files in an Amazon S3 bucket with S3 Object Lock enabled in compliance mode
Why this is correct
This option is correct. CloudTrail records API calls, and log file validation provides integrity. S3 Object Lock in compliance mode prevents any user, including the root user, from deleting or modifying the log files for the retention period, satisfying the tamper-proof retention requirement.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS Config with a HIPAA conformance pack, and store the configuration history in an Amazon S3 bucket with versioning enabled
Why it's wrong here
AWS Config tracks resource configuration changes, not API calls. While versioning helps protect against accidental overwrites, it does not prevent intentional deletion by authorized users. S3 Object Lock is required for strict write-once-read-many (WORM) compliance. Additionally, the HIPAA conformance pack is for evaluating configurations against HIPAA rules, not for recording API calls.
When this WOULD be correct
An organization needs to continuously monitor and record changes to AWS resource configurations for compliance with HIPAA, and must retain configuration history for 7 years with protection against modification or deletion. In that case, AWS Config with a conformance pack and S3 bucket with versioning would be appropriate.
- ✗
Amazon GuardDuty with findings exported to an Amazon S3 bucket, and enable MFA Delete on the bucket
Why it's wrong here
GuardDuty is a threat detection service that identifies suspicious activity; it does not record all API calls. MFA Delete requires multi-factor authentication to delete objects but does not block deletion by the root user who holds the MFA device. It is not sufficient for a strict 7-year retention requirement.
When this WOULD be correct
A company needs to detect and respond to suspicious API activity and protect findings from accidental deletion. GuardDuty with findings exported to S3 with MFA Delete would be correct if the requirement is for threat detection and basic deletion protection, not full API auditing or immutable retention.
- ✗
AWS CloudTrail with log file validation enabled, and store the log files in an Amazon S3 bucket with MFA Delete enabled
Why it's wrong here
While CloudTrail with log file validation is correct for recording API calls and ensuring integrity, MFA Delete does not provide the same level of protection as S3 Object Lock in compliance mode. The root user can still delete objects because they own the MFA device. S3 Object Lock in compliance mode is the only option that prevents any user (including root) from deleting objects.
When this WOULD be correct
A company needs to record AWS API calls for auditing and must protect the logs from accidental or unauthorized deletion, but does not require a fixed retention period or protection against modification. MFA Delete would be sufficient to prevent deletion unless the root user with MFA approves it.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The CLF-C02 exam frequently reuses these exact scenarios with slightly different constraints.
✓AWS CloudTrail with log file validation enabled, and store the log files in an Amazon S3 bucket with S3 Object Lock enabled in compliance modeCorrect answer▾
Why this is correct
This option is correct. CloudTrail records API calls, and log file validation provides integrity. S3 Object Lock in compliance mode prevents any user, including the root user, from deleting or modifying the log files for the retention period, satisfying the tamper-proof retention requirement.
✗AWS Config with a HIPAA conformance pack, and store the configuration history in an Amazon S3 bucket with versioning enabledWrong answer — click to see why▾
Why this is wrong here
AWS Config records resource configuration changes, not API calls. It does not meet the requirement to record all AWS API calls for auditing.
★ When this WOULD be the correct answer
An organization needs to continuously monitor and record changes to AWS resource configurations for compliance with HIPAA, and must retain configuration history for 7 years with protection against modification or deletion. In that case, AWS Config with a conformance pack and S3 bucket with versioning would be appropriate.
Why candidates choose this
Candidates may confuse AWS Config's configuration history with API call logging, or think that a HIPAA conformance pack automatically addresses all auditing requirements.
✗Amazon GuardDuty with findings exported to an Amazon S3 bucket, and enable MFA Delete on the bucketWrong answer — click to see why▾
Why this is wrong here
Amazon GuardDuty detects threats but does not record all AWS API calls for auditing; its findings are not a complete audit trail of API activity, and MFA Delete alone does not prevent deletion by the root user or provide the immutability required for 7-year retention under HIPAA.
★ When this WOULD be the correct answer
A company needs to detect and respond to suspicious API activity and protect findings from accidental deletion. GuardDuty with findings exported to S3 with MFA Delete would be correct if the requirement is for threat detection and basic deletion protection, not full API auditing or immutable retention.
Why candidates choose this
Candidates may confuse GuardDuty's threat detection with CloudTrail's API auditing, and MFA Delete seems like strong protection, but it does not prevent root user deletion or provide the compliance-mode immutability required for HIPAA.
✗AWS CloudTrail with log file validation enabled, and store the log files in an Amazon S3 bucket with MFA Delete enabledWrong answer — click to see why▾
Why this is wrong here
MFA Delete protects against accidental or unauthorized deletion but does not prevent modification of objects, nor does it enforce a retention period. HIPAA requires immutable logs for 7 years, which S3 Object Lock in compliance mode provides by preventing any deletion or modification, even by the root user.
★ When this WOULD be the correct answer
A company needs to record AWS API calls for auditing and must protect the logs from accidental or unauthorized deletion, but does not require a fixed retention period or protection against modification. MFA Delete would be sufficient to prevent deletion unless the root user with MFA approves it.
Why candidates choose this
Candidates may confuse MFA Delete with Object Lock, thinking that requiring multi-factor authentication for deletion provides sufficient protection. They might also overlook the need for immutability and a fixed retention period required by HIPAA.
Analysis generated from the official CLF-C02blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse MFA Delete with S3 Object Lock, not realizing that MFA Delete can be bypassed by the root user who controls the MFA device, whereas compliance mode enforces a legal hold that even the root user cannot override.
Detailed technical explanation
How to think about this question
S3 Object Lock in compliance mode uses a retention mode that prevents any user, including the root user, from deleting or overwriting an object until the retention period expires. CloudTrail log file validation creates a digest file that contains the hash of each log file and the previous digest, forming a chain of trust that can be verified using the AWS CLI or SDK. In a real-world HIPAA audit, the combination ensures that logs are both tamper-evident and legally immutable, satisfying the requirement for 'write once, read many' (WORM) storage.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Security and Compliance — This question tests Security and Compliance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: AWS CloudTrail with log file validation enabled, and store the log files in an Amazon S3 bucket with S3 Object Lock enabled in compliance mode — Option A is correct because AWS CloudTrail with log file validation enabled ensures the integrity of the API call logs by using a digital signature (SHA-256 hash) to detect any tampering. Storing these logs in an Amazon S3 bucket with S3 Object Lock in compliance mode prevents any user, including the root user, from overwriting or deleting the objects for the specified retention period (7 years), meeting HIPAA's immutable audit log requirements.
What should I do if I get this CLF-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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