- A
Enable S3 Block Public Access on both the bucket and the AWS account.
Block Public Access prevents accidental public exposure through bucket policies, ACLs, and other public settings. It is a strong baseline control when the data must remain private.
- B
Continue using object ACLs so each customer invoice can be made public briefly.
Why wrong: ACLs are discouraged for modern S3 designs because they are harder to manage and easier to misconfigure. Brief public exposure also conflicts with the requirement to keep the bucket private.
- C
Configure Bucket owner enforced object ownership to disable ACLs.
Bucket owner enforced turns off ACL-based access control and makes the bucket owner own every object. That simplifies governance and aligns with the requirement to avoid ACLs.
- D
Generate presigned URLs for customers to download specific invoices for a limited time.
Presigned URLs provide temporary access to a single object without making the bucket public. They are ideal for time-limited downloads where you want controlled external sharing.
- E
Move the bucket to another AWS Region to isolate it from the internet.
Why wrong: Changing Regions does not make S3 private and does not solve access control problems. Privacy depends on policies and public access controls, not physical Region placement.
SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure architectures. 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 stores customer invoices in an Amazon S3 bucket. The application must keep the bucket private, ACLs should not be used, and customers should receive temporary download links for individual invoices. Which three changes should the architect make? Select three.
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
Enable S3 Block Public Access on both the bucket and the AWS account.
Option A is correct because enabling S3 Block Public Access at both the bucket and account level ensures that no public access can be granted to the bucket or its objects, which aligns with the requirement to keep the bucket private. This setting overrides any other permissions that might inadvertently allow public access, providing a strong security baseline.
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 S3 Block Public Access on both the bucket and the AWS account.
Why this is correct
Block Public Access prevents accidental public exposure through bucket policies, ACLs, and other public settings. It is a strong baseline control when the data must remain private.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Continue using object ACLs so each customer invoice can be made public briefly.
Why it's wrong here
ACLs are discouraged for modern S3 designs because they are harder to manage and easier to misconfigure. Brief public exposure also conflicts with the requirement to keep the bucket private.
- ✓
Configure Bucket owner enforced object ownership to disable ACLs.
Why this is correct
Bucket owner enforced turns off ACL-based access control and makes the bucket owner own every object. That simplifies governance and aligns with the requirement to avoid ACLs.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Generate presigned URLs for customers to download specific invoices for a limited time.
Why this is correct
Presigned URLs provide temporary access to a single object without making the bucket public. They are ideal for time-limited downloads where you want controlled external sharing.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Move the bucket to another AWS Region to isolate it from the internet.
Why it's wrong here
Changing Regions does not make S3 private and does not solve access control problems. Privacy depends on policies and public access controls, not physical Region placement.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates might think moving the bucket to a different region or using ACLs can solve the temporary access requirement, but they overlook that S3 Block Public Access and presigned URLs are the correct mechanisms for private, time-limited access without ACLs.
Detailed technical explanation
How to think about this question
Presigned URLs (Option D) are generated using AWS Signature Version 4, which allows you to grant time-limited access to a specific S3 object without changing the object's permissions. Bucket owner enforced object ownership (Option C) disables ACLs at the bucket level, ensuring all objects are owned by the bucket owner and access is controlled solely by IAM policies and bucket policies, which is a best practice for security and compliance.
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.
What to study next
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Secure Architectures — This question tests Design Secure Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable S3 Block Public Access on both the bucket and the AWS account. — Option A is correct because enabling S3 Block Public Access at both the bucket and account level ensures that no public access can be granted to the bucket or its objects, which aligns with the requirement to keep the bucket private. This setting overrides any other permissions that might inadvertently allow public access, providing a strong security baseline.
What should I do if I get this SAA-C03 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: Jun 11, 2026
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