- A
Enable MFA Delete on the bucket
Why wrong: MFA Delete provides extra protection but is not required.
- B
Enable S3 Block Public Access
Why wrong: This prevents public access but does not protect against deletion.
- C
Add a bucket policy that denies PutObject if the object is not encrypted with SSE-KMS
This ensures all uploads use SSE-KMS.
- D
Enable S3 Versioning on the bucket
Versioning allows recovery of deleted objects.
- E
Set default encryption to SSE-S3
Why wrong: SSE-S3 does not meet the requirement for KMS encryption.
Question 314 of 1,786
DEA-C01 Data Store Management Practice Question
This DEA-C01 practice question tests your understanding of data store management. 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 financial services company stores sensitive transaction data in an Amazon S3 bucket. Compliance requires that all objects be encrypted using SSE-KMS and that the bucket be protected from accidental deletion. Which combination of actions meets these requirements? (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
✓
Add a bucket policy that denies PutObject if the object is not encrypted with SSE-KMS
Option C is correct because a bucket policy with a condition denying PutObject unless the object's encryption status matches SSE-KMS (using the s3:x-amz-server-side-encryption-aws-kms-key-id condition key) enforces encryption at the upload level. This ensures that any object written to the bucket must be encrypted with a KMS key, meeting the compliance requirement.
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 MFA Delete on the bucket
Why it's wrong here
MFA Delete provides extra protection but is not required.
- ✗
Enable S3 Block Public Access
Why it's wrong here
This prevents public access but does not protect against deletion.
- ✓
Add a bucket policy that denies PutObject if the object is not encrypted with SSE-KMS
Why this is correct
This ensures all uploads use SSE-KMS.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Enable S3 Versioning on the bucket
Why this is correct
Versioning allows recovery of deleted objects.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Set default encryption to SSE-S3
Why it's wrong here
SSE-S3 does not meet the requirement for KMS encryption.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse default encryption (which only applies when no encryption header is provided) with a bucket policy that enforces encryption on every upload, or they mistakenly think MFA Delete or Block Public Access can enforce encryption requirements.
Detailed technical explanation
How to think about this question
SSE-KMS uses AWS KMS customer master keys (CMKs) to encrypt objects, providing separate permissions for key usage and audit trails via AWS CloudTrail. The bucket policy condition 's3:x-amz-server-side-encryption' with value 'aws:kms' ensures that PutObject requests must include the x-amz-server-side-encryption header set to 'aws:kms', and the condition 's3:x-amz-server-side-encryption-aws-kms-key-id' can further restrict to a specific KMS key. Without such a policy, a user with s3:PutObject permission could bypass default encryption by explicitly omitting encryption headers.
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 DEA-C01 question test?
Data Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add a bucket policy that denies PutObject if the object is not encrypted with SSE-KMS — Option C is correct because a bucket policy with a condition denying PutObject unless the object's encryption status matches SSE-KMS (using the s3:x-amz-server-side-encryption-aws-kms-key-id condition key) enforces encryption at the upload level. This ensures that any object written to the bucket must be encrypted with a KMS key, meeting the compliance requirement.
What should I do if I get this DEA-C01 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: Jul 4, 2026
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