- A
Enable CloudTrail data events for the S3 bucket.
S3 data events record object-level API activity such as GetObject, PutObject, and DeleteObject, along with the IAM principal or role session that made the call. That visibility is required to determine exactly who downloaded which object and when.
- B
Include CloudTrail management events for KMS API calls on the customer managed key.
KMS Decrypt and related key operations are logged as management events in CloudTrail. Enabling those events makes it possible to correlate object reads with key usage and confirm whether the ciphertext was actually decrypted during the suspected exfiltration window.
- C
Enable S3 Object Lock in compliance mode.
Why wrong: Object Lock protects objects from deletion or overwrite, which is useful for retention and immutability, but it does not provide audit visibility into who downloaded the files. It is a preventive and retention control, not the detective control requested here.
- D
Turn on default bucket encryption with SSE-KMS.
Why wrong: Default encryption ensures new objects are stored encrypted at rest, but it does not create an audit trail for object downloads or KMS Decrypt activity. The question asks for investigative visibility, not just encryption configuration.
- E
Enable MFA Delete on the bucket.
Why wrong: MFA Delete helps prevent deletion of versions, but it does not log object read activity or KMS API usage. It is unrelated to determining who accessed the data during the incident.
SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure architectures. 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.
Security responders suspect exfiltration from an Amazon S3 bucket that stores sensitive reports encrypted with a customer managed KMS key. They need to identify which IAM principal downloaded each object and whether any principals called KMS Decrypt on the key during the same time window. Which two detective controls should be enabled? Select two.
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
Enable CloudTrail data events for the S3 bucket.
Option A is correct because enabling CloudTrail data events for the S3 bucket captures detailed logs of object-level operations, including GetObject (download) requests. This allows you to identify which IAM principal downloaded each object, including the source IP, user agent, and request time. Without data events, CloudTrail only logs management-level actions (e.g., bucket creation) and misses object-level access.
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.
- ✓
Enable CloudTrail data events for the S3 bucket.
Why this is correct
S3 data events record object-level API activity such as GetObject, PutObject, and DeleteObject, along with the IAM principal or role session that made the call. That visibility is required to determine exactly who downloaded which object and when.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Include CloudTrail management events for KMS API calls on the customer managed key.
Why this is correct
KMS Decrypt and related key operations are logged as management events in CloudTrail. Enabling those events makes it possible to correlate object reads with key usage and confirm whether the ciphertext was actually decrypted during the suspected exfiltration window.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable S3 Object Lock in compliance mode.
Why it's wrong here
Object Lock protects objects from deletion or overwrite, which is useful for retention and immutability, but it does not provide audit visibility into who downloaded the files. It is a preventive and retention control, not the detective control requested here.
When this WOULD be correct
A question asks: 'A company must prevent any user, including the root user, from deleting or overwriting critical S3 objects for a 7-year regulatory retention period. Which feature should be enabled?' In that scenario, S3 Object Lock in compliance mode is correct because it enforces a retention lock that cannot be removed by any user.
- ✗
Turn on default bucket encryption with SSE-KMS.
Why it's wrong here
Default encryption ensures new objects are stored encrypted at rest, but it does not create an audit trail for object downloads or KMS Decrypt activity. The question asks for investigative visibility, not just encryption configuration.
When this WOULD be correct
A question asks: 'Which control ensures that all objects uploaded to an S3 bucket are encrypted at rest using a customer managed KMS key, even if the uploader does not specify encryption?' In that scenario, enabling default bucket encryption with SSE-KMS is the correct answer.
- ✗
Enable MFA Delete on the bucket.
Why it's wrong here
MFA Delete helps prevent deletion of versions, but it does not log object read activity or KMS API usage. It is unrelated to determining who accessed the data during the incident.
When this WOULD be correct
An exam question asks: 'A company wants to prevent accidental or malicious deletion of objects in an S3 bucket. Which feature should be enabled?' In that context, MFA Delete is correct because it requires MFA for delete operations.
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 SAA-C03 exam frequently reuses these exact scenarios with slightly different constraints.
✓Enable CloudTrail data events for the S3 bucket.Correct answer▾
Why this is correct
S3 data events record object-level API activity such as GetObject, PutObject, and DeleteObject, along with the IAM principal or role session that made the call. That visibility is required to determine exactly who downloaded which object and when.
✗Enable S3 Object Lock in compliance mode.Wrong answer — click to see why▾
Why this is wrong here
S3 Object Lock in compliance mode prevents object deletion or overwrite for a fixed retention period, but it does not log or audit who downloaded objects or called KMS Decrypt, so it cannot identify exfiltration or unauthorized decryption.
★ When this WOULD be the correct answer
A question asks: 'A company must prevent any user, including the root user, from deleting or overwriting critical S3 objects for a 7-year regulatory retention period. Which feature should be enabled?' In that scenario, S3 Object Lock in compliance mode is correct because it enforces a retention lock that cannot be removed by any user.
Why candidates choose this
Candidates may confuse 'Object Lock' with 'access logging' or think that locking objects prevents exfiltration, but exfiltration involves reading/copying data, not deletion, and Object Lock does not provide audit trails.
✗Turn on default bucket encryption with SSE-KMS.Wrong answer — click to see why▾
Why this is wrong here
Enabling default bucket encryption with SSE-KMS does not provide detective controls to identify which IAM principal downloaded objects or called KMS Decrypt. It only ensures data is encrypted at rest, not who accessed it.
★ When this WOULD be the correct answer
A question asks: 'Which control ensures that all objects uploaded to an S3 bucket are encrypted at rest using a customer managed KMS key, even if the uploader does not specify encryption?' In that scenario, enabling default bucket encryption with SSE-KMS is the correct answer.
Why candidates choose this
Candidates may confuse encryption controls with audit controls, thinking that SSE-KMS logging provides access details, but it does not track per-object downloads or KMS Decrypt calls by principal.
✗Enable MFA Delete on the bucket.Wrong answer — click to see why▾
Why this is wrong here
MFA Delete is a versioning feature that requires multi-factor authentication to delete objects or change versioning state; it does not log or audit who downloaded objects or called KMS Decrypt, so it cannot identify exfiltration or KMS API calls.
★ When this WOULD be the correct answer
An exam question asks: 'A company wants to prevent accidental or malicious deletion of objects in an S3 bucket. Which feature should be enabled?' In that context, MFA Delete is correct because it requires MFA for delete operations.
Why candidates choose this
Candidates may think MFA Delete provides an audit trail or security control that could detect exfiltration, but it only protects against deletion, not data access or API logging.
Analysis generated from the official SAA-C03blueprint 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 often think CloudTrail management events cover all KMS activity, but KMS Decrypt on a customer managed key is indeed a management event, while S3 object downloads require data events; confusing these two event types leads to missing the correct pairing.
Detailed technical explanation
How to think about this question
CloudTrail data events for S3 capture GetObject, PutObject, and DeleteObject operations at the object level, recording the IAM principal ARN, source IP, and request parameters. For KMS, management events include Decrypt calls on customer managed keys, but note that S3 can use KMS via the S3 service principal, so the actual IAM principal making the request is logged in the S3 data event, not the KMS event. In a real-world scenario, correlating S3 data events (GetObject) with KMS management events (Decrypt) within the same time window reveals whether the downloader also triggered decryption, which is critical for detecting unauthorized exfiltration.
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
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Secure Architectures — This question tests Design Secure Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable CloudTrail data events for the S3 bucket. — Option A is correct because enabling CloudTrail data events for the S3 bucket captures detailed logs of object-level operations, including GetObject (download) requests. This allows you to identify which IAM principal downloaded each object, including the source IP, user agent, and request time. Without data events, CloudTrail only logs management-level actions (e.g., bucket creation) and misses object-level access.
What should I do if I get this SAA-C03 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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