- A
The S3 bucket has Amazon S3 Transfer Acceleration enabled, which is not supported by CodePipeline.
Why wrong: Transfer Acceleration is supported by CodePipeline.
- B
The KMS key used to encrypt the bucket objects has been rotated, causing the pipeline to lose access.
Why wrong: The error mentions bucket policy, not KMS.
- C
The artifact bucket is in a different AWS Region than the pipeline, and cross-region replication is not enabled.
Why wrong: Cross-region pipelines use separate artifact buckets; replication is not required.
- D
The artifact bucket's bucket policy does not grant the necessary permissions to the CodePipeline service role.
CodePipeline needs read/write permissions on the artifact bucket; a misconfigured bucket policy can cause this error.
Question 1,640 of 1,750
Resolving CodePipeline Artifact Bucket Policy Misconfiguration Error
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.
A company has a CI/CD pipeline using AWS CodePipeline and AWS CodeBuild. The build stage runs unit tests and produces a JUnit report. The pipeline includes a test action that publishes results to an S3 bucket. Recently, the pipeline started failing with the error: 'The action could not be started because the artifact bucket policy is misconfigured.' What is the most likely cause?
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 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
✓
The artifact bucket's bucket policy does not grant the necessary permissions to the CodePipeline service role.
Option D is correct because AWS CodePipeline requires the artifact bucket's bucket policy to grant the CodePipeline service role (or the pipeline's assumed role) permissions to perform actions like s3:GetObject, s3:PutObject, and s3:GetBucketVersioning. When the bucket policy is misconfigured—for example, missing a principal or action—the pipeline's test action cannot start, resulting in the specific error message. This is a common IAM/permissions issue rather than a regional or encryption key problem.
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 S3 bucket has Amazon S3 Transfer Acceleration enabled, which is not supported by CodePipeline.
Why it's wrong here
Transfer Acceleration is supported by CodePipeline.
- ✗
The KMS key used to encrypt the bucket objects has been rotated, causing the pipeline to lose access.
Why it's wrong here
The error mentions bucket policy, not KMS.
- ✗
The artifact bucket is in a different AWS Region than the pipeline, and cross-region replication is not enabled.
Why it's wrong here
Cross-region pipelines use separate artifact buckets; replication is not required.
- ✓
The artifact bucket's bucket policy does not grant the necessary permissions to the CodePipeline service role.
Why this is correct
CodePipeline needs read/write permissions on the artifact bucket; a misconfigured bucket policy can cause this error.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume the error is due to KMS key rotation or cross-region issues, but the specific wording 'artifact bucket policy is misconfigured' directly points to an IAM/bucket policy permission problem, not encryption or replication settings.
Detailed technical explanation
How to think about this question
Under the hood, CodePipeline uses the artifact bucket to store input and output artifacts for each action. The bucket policy must explicitly allow the CodePipeline service principal (codepipeline.amazonaws.com) or the pipeline's execution role to perform versioning-related operations (s3:GetBucketVersioning) and object operations (s3:GetObject, s3:PutObject). A common misconfiguration is forgetting to include the s3:GetBucketVersioning permission, which CodePipeline requires to enable artifact versioning and prevent overwrites. In real-world scenarios, this error often appears after a bucket policy is manually edited or replaced, breaking the implicit trust.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
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 artifact bucket's bucket policy does not grant the necessary permissions to the CodePipeline service role. — Option D is correct because AWS CodePipeline requires the artifact bucket's bucket policy to grant the CodePipeline service role (or the pipeline's assumed role) permissions to perform actions like s3:GetObject, s3:PutObject, and s3:GetBucketVersioning. When the bucket policy is misconfigured—for example, missing a principal or action—the pipeline's test action cannot start, resulting in the specific error message. This is a common IAM/permissions issue rather than a regional or encryption key problem.
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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Last reviewed: Jul 4, 2026
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