The answer is the missing `x-amz-acl` header with value `bucket-owner-full-control`. When a user in Account A uploads an object to a bucket in Account B, the object is owned by Account A by default, which prevents Account B from managing it. Including the `bucket-owner-full-control` ACL in the upload request explicitly transfers object ownership to the bucket owner, satisfying the cross-account S3 upload requirement. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of how IAM policies can enforce specific headers via condition keys, a common trap where candidates overlook the ACL requirement and focus only on permissions. The key distinction is that even with valid `s3:PutObject` access, the upload fails if the required header is absent. Memory tip: think “BOFC” — Bucket Owner Full Control — as the magic handshake that makes cross-account uploads stick.
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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 uses cross-account S3 access. The above IAM policy is attached to an IAM user in Account A. The user tries to upload an object to a bucket in Account B, but 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 upload request does not include the 'x-amz-acl' header with value 'bucket-owner-full-control'.
Option B is correct. The policy requires the x-amz-acl header to be set to 'bucket-owner-full-control', but the user likely did not include that header. Option A is wrong because the policy allows s3:PutObject. Option C is wrong because the resource is the bucket ARN. Option D is wrong because the bucket policy is not shown, but the IAM policy is correct.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 upload request does not include the 'x-amz-acl' header with value 'bucket-owner-full-control'.
Why this is correct
The condition requires that header to be set.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The resource ARN in the policy is incorrect; it should include the bucket name only.
Why it's wrong here
The ARN is correct for objects in the bucket.
✗
The bucket policy in Account B denies the upload.
Why it's wrong here
The bucket policy is not shown; the IAM policy itself is the likely cause.
✗
The IAM user does not have permission to call s3:PutObject.
Why it's wrong here
The policy explicitly allows s3:PutObject.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Trap categories for this question
Command / output trap
The bucket policy is not shown; the IAM policy itself is the likely cause.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SAP-C02 ACL questions on filtering logic and placement.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The upload request does not include the 'x-amz-acl' header with value 'bucket-owner-full-control'. — Option B is correct. The policy requires the x-amz-acl header to be set to 'bucket-owner-full-control', but the user likely did not include that header. Option A is wrong because the policy allows s3:PutObject. Option C is wrong because the resource is the bucket ARN. Option D is wrong because the bucket policy is not shown, but the IAM policy is correct.
What should I do if I get this SAP-C02 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SAP-C02 ACL questions on filtering logic and placement.
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?
Standard ACLs match source addresses.
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