This DOP-C02 practice question tests your understanding of sdlc automation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Refer to the exhibit. A DevOps engineer is troubleshooting a cross-account deployment where an AWS CodeBuild project in Account A needs to upload build artifacts to an S3 bucket in Account B. The engineer attaches this IAM policy to the CodeBuild service role in Account A. However, the upload fails. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The condition requires bucket-owner-full-control ACL, but the bucket policy may not allow it
Option B is correct because the IAM policy includes a condition that requires the `bucket-owner-full-control` canned ACL (`s3:x-amz-acl: bucket-owner-full-control`). For this condition to be satisfied, the bucket policy in Account B must explicitly allow the `s3:PutObject` action with that ACL. If the bucket policy does not include a statement granting `s3:PutObject` with the condition that the ACL is `bucket-owner-full-control`, the upload will fail with an access denied error, even if the IAM policy in Account A appears permissive.
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.
✗
The bucket policy in Account B grants s3:PutObject to Account A
Why it's wrong here
That would help, but the issue is the condition.
✓
The condition requires bucket-owner-full-control ACL, but the bucket policy may not allow it
Why this is correct
Cross-account uploads often require bucket policy to grant permissions.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The policy does not include s3:PutObjectAcl permission
Why it's wrong here
PutObjectAcl is not required for upload.
✗
The policy does not include s3:GetObject permission
Why it's wrong here
GetObject is not needed for upload.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume the IAM policy alone is sufficient for cross-account S3 uploads, overlooking that the bucket policy in the target account must explicitly allow the specific ACL condition required by the IAM policy.
Detailed technical explanation
How to think about this question
The `s3:x-amz-acl` condition key enforces that the `x-amz-acl` header in the PUT request must match the specified value (`bucket-owner-full-control`). When the bucket policy in Account B does not include a statement that allows `s3:PutObject` with a condition on `s3:x-amz-acl` (or uses a broader allow without ACL restrictions), the request fails because the condition in the IAM policy is not met. In cross-account scenarios, the bucket owner must explicitly grant permissions for the requested ACL to avoid ownership issues.
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.
Visual reference
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The condition requires bucket-owner-full-control ACL, but the bucket policy may not allow it — Option B is correct because the IAM policy includes a condition that requires the `bucket-owner-full-control` canned ACL (`s3:x-amz-acl: bucket-owner-full-control`). For this condition to be satisfied, the bucket policy in Account B must explicitly allow the `s3:PutObject` action with that ACL. If the bucket policy does not include a statement granting `s3:PutObject` with the condition that the ACL is `bucket-owner-full-control`, the upload will fail with an access denied error, even if the IAM policy in Account A appears permissive.
What should I do if I get this DOP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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