The correct solution is to enable S3 default encryption with AWS KMS and activate automatic yearly rotation of the customer master key. This directly satisfies the requirement because S3 default encryption ensures every new object written to the bucket is automatically encrypted at rest, and by selecting an AWS KMS key (SSE-KMS) with automatic rotation enabled, the key material is rotated annually without any manual intervention. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of the distinction between S3 encryption options: SSE-S3 uses Amazon-managed keys with no customer control over rotation, SSE-C requires you to manage your own keys, and client-side encryption bypasses S3 server-side controls entirely. A common trap is confusing SSE-KMS with SSE-S3, but remember that only KMS keys support configurable automatic rotation. Memory tip: “KMS rotates, S3 encrypts” — the bucket handles encryption, the key handles rotation.
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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 company is using Amazon S3 to store critical data. The security team requires that all data at rest be encrypted using AWS KMS with automatic rotation of the customer master key (CMK) every year. What should a solutions architect do to meet this requirement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable S3 default encryption with AWS KMS and enable automatic rotation of the KMS key.
Option A is correct because using S3 default encryption with an AWS KMS CMK and enabling automatic key rotation meets the requirement. Option B is wrong because SSE-S3 uses Amazon S3-managed keys, not KMS. Option C is wrong because SSE-C uses customer-provided keys, not KMS. Option D is wrong because client-side encryption does not use S3 server-side encryption.
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.
✗
Use SSE-S3 (Amazon S3-managed keys) and rely on S3's automatic key rotation.
Why it's wrong here
SSE-S3 keys are managed by S3 and rotate automatically, but they are not KMS keys.
✓
Enable S3 default encryption with AWS KMS and enable automatic rotation of the KMS key.
Why this is correct
This ensures all objects are encrypted at rest with a rotating KMS key.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use SSE-C (customer-provided keys) and manage key rotation manually.
Why it's wrong here
SSE-C does not use KMS and requires manual key management.
✗
Use client-side encryption with a KMS CMK and upload the encrypted data.
Why it's wrong here
Client-side encryption is not server-side encryption.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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.
What to study next
Got this wrong? Here's your next step.
Identify which SAP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable S3 default encryption with AWS KMS and enable automatic rotation of the KMS key. — Option A is correct because using S3 default encryption with an AWS KMS CMK and enabling automatic key rotation meets the requirement. Option B is wrong because SSE-S3 uses Amazon S3-managed keys, not KMS. Option C is wrong because SSE-C uses customer-provided keys, not KMS. Option D is wrong because client-side encryption does not use S3 server-side encryption.
What should I do if I get this SAP-C02 question wrong?
Identify which SAP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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