- A
Attach an identity-based policy in each account that denies CloudTrail changes.
Why wrong: Identity policies are easy to bypass if account admins can create other roles or policies within the same account.
- B
Use a service control policy on the sandbox organizational unit to deny the prohibited actions.
Service control policies are the correct governance mechanism for setting guardrails across multiple accounts in AWS Organizations. An SCP can explicitly deny sensitive actions such as disabling CloudTrail or deleting the audit bucket, and those denies apply even if administrators create local IAM policies that would otherwise allow the actions. SCPs do not grant permissions by themselves; they only constrain what account principals can ever do within the OU.
- C
Create an S3 bucket policy that allows only the audit team role to delete objects.
Why wrong: A bucket policy can protect the bucket itself, but it does not stop CloudTrail from being disabled in the account.
- D
Apply a permission boundary to each IAM user in the sandbox accounts.
Why wrong: Permission boundaries help control specific IAM principals, but they do not provide a broad account-level guardrail across all principals and services.
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 uses AWS Organizations and has separate development, test, and production accounts. The security team wants to ensure that no one in the sandbox organizational unit can disable AWS CloudTrail or delete the central audit bucket, even if an account administrator creates permissive IAM policies later. Which control should they use?
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
Use a service control policy on the sandbox organizational unit to deny the prohibited actions.
Service control policies (SCPs) are the correct mechanism because they act as a centralized guardrail at the AWS Organizations level, setting maximum permissions for all accounts in an organizational unit (OU). Even if an account administrator creates permissive IAM policies later, an SCP that explicitly denies disabling CloudTrail or deleting the central audit bucket will override those permissions, ensuring the security team's requirements are enforced across the sandbox OU.
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.
- ✗
Attach an identity-based policy in each account that denies CloudTrail changes.
Why it's wrong here
Identity policies are easy to bypass if account admins can create other roles or policies within the same account.
When this WOULD be correct
This option would be correct if the question asked for a way to restrict CloudTrail changes for a specific IAM user or role within a single account, without needing to enforce the restriction across multiple accounts or prevent override by an account admin.
- ✓
Use a service control policy on the sandbox organizational unit to deny the prohibited actions.
Why this is correct
Service control policies are the correct governance mechanism for setting guardrails across multiple accounts in AWS Organizations. An SCP can explicitly deny sensitive actions such as disabling CloudTrail or deleting the audit bucket, and those denies apply even if administrators create local IAM policies that would otherwise allow the actions. SCPs do not grant permissions by themselves; they only constrain what account principals can ever do within the OU.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create an S3 bucket policy that allows only the audit team role to delete objects.
Why it's wrong here
A bucket policy can protect the bucket itself, but it does not stop CloudTrail from being disabled in the account.
When this WOULD be correct
This would be correct in a scenario where the requirement is to restrict deletion of objects within a specific S3 bucket to only an audit team role, while other users can still read or write. For example, a question asking 'How to ensure only the audit team can delete audit logs from the central bucket?'
- ✗
Apply a permission boundary to each IAM user in the sandbox accounts.
Why it's wrong here
Permission boundaries help control specific IAM principals, but they do not provide a broad account-level guardrail across all principals and services.
When this WOULD be correct
A question where the requirement is to restrict the maximum permissions for specific IAM users or roles within an account, such as limiting developers to read-only access while allowing them to create their own IAM roles within those bounds.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SAA-C03 exam frequently reuses these exact scenarios with slightly different constraints.
✓Use a service control policy on the sandbox organizational unit to deny the prohibited actions.Correct answer▾
Why this is correct
Service control policies are the correct governance mechanism for setting guardrails across multiple accounts in AWS Organizations. An SCP can explicitly deny sensitive actions such as disabling CloudTrail or deleting the audit bucket, and those denies apply even if administrators create local IAM policies that would otherwise allow the actions. SCPs do not grant permissions by themselves; they only constrain what account principals can ever do within the OU.
✗Attach an identity-based policy in each account that denies CloudTrail changes.Wrong answer — click to see why▾
Why this is wrong here
Identity-based policies can be overridden by a more permissive policy attached by an account administrator, so they do not provide a guaranteed guardrail across all accounts in the organizational unit.
★ When this WOULD be the correct answer
This option would be correct if the question asked for a way to restrict CloudTrail changes for a specific IAM user or role within a single account, without needing to enforce the restriction across multiple accounts or prevent override by an account admin.
Why candidates choose this
Candidates may think identity-based policies are sufficient for restricting actions, but they overlook that account administrators can attach permissive policies that override the deny, making SCPs necessary for organization-wide enforcement.
✗Create an S3 bucket policy that allows only the audit team role to delete objects.Wrong answer — click to see why▾
Why this is wrong here
An S3 bucket policy only controls access to the bucket itself, not the ability to disable CloudTrail or delete the bucket from other services like IAM or CloudTrail. It does not prevent an account administrator from disabling CloudTrail entirely or deleting the bucket via the console or API.
★ When this WOULD be the correct answer
This would be correct in a scenario where the requirement is to restrict deletion of objects within a specific S3 bucket to only an audit team role, while other users can still read or write. For example, a question asking 'How to ensure only the audit team can delete audit logs from the central bucket?'
Why candidates choose this
Candidates may think a bucket policy is sufficient to protect the audit bucket, overlooking that CloudTrail can be disabled independently or that the bucket itself can be deleted via other means.
✗Apply a permission boundary to each IAM user in the sandbox accounts.Wrong answer — click to see why▾
Why this is wrong here
Permission boundaries limit the maximum permissions for IAM users but do not prevent account administrators from creating permissive IAM policies that bypass the boundary, nor do they protect against actions taken by the root user or other principals. They are not effective for preventing CloudTrail disabling or bucket deletion across all users in an account.
★ When this WOULD be the correct answer
A question where the requirement is to restrict the maximum permissions for specific IAM users or roles within an account, such as limiting developers to read-only access while allowing them to create their own IAM roles within those bounds.
Why candidates choose this
Candidates may confuse permission boundaries with service control policies, thinking they can centrally enforce restrictions on all users, but boundaries only apply to IAM principals and can be overridden by account administrators.
Analysis generated from the official SAA-C03blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse service control policies with IAM permission boundaries or resource-based policies, thinking that a bucket policy or permission boundary can prevent service-level actions like disabling CloudTrail, when only an SCP can enforce such restrictions across all principals in an entire OU.
Detailed technical explanation
How to think about this question
Under the hood, SCPs are evaluated as an explicit deny that cannot be overridden by any allow within the account, following the AWS authorization model where an explicit deny always takes precedence. A common real-world scenario is when a developer in the sandbox account creates an IAM role with full administrator access; without an SCP, that role could disable CloudTrail, but with an SCP denying `cloudtrail:StopLogging` and `cloudtrail:DeleteTrail`, the action is blocked regardless of the role's permissions. SCPs do not grant permissions themselves; they only filter what is allowed by identity-based or resource-based policies.
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: Use a service control policy on the sandbox organizational unit to deny the prohibited actions. — Service control policies (SCPs) are the correct mechanism because they act as a centralized guardrail at the AWS Organizations level, setting maximum permissions for all accounts in an organizational unit (OU). Even if an account administrator creates permissive IAM policies later, an SCP that explicitly denies disabling CloudTrail or deleting the central audit bucket will override those permissions, ensuring the security team's requirements are enforced across the sandbox OU.
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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