- A
Add an Allow statement for 's3:GetObject' on 'ml-data-123' to the IAM policy.
Why wrong: Explicit denies take precedence over allows; adding an allow does not remove the deny.
- B
Remove the Deny statement from the IAM policy.
An explicit deny overrides any allow; removing the deny allows the existing S3 actions to work.
- C
Create an S3 access point and update the IAM policy to use the access point ARN.
Why wrong: Access points provide granular access but do not override explicit denies in IAM.
- D
Add a bucket policy on 'ml-data-123' that grants access to the notebook's IAM role.
Why wrong: The IAM role already has a Deny; adding a bucket policy does not override the explicit deny.
Question 1,237 of 1,755
MLS-C01 Data Engineering Practice Question
This MLS-C01 practice question tests your understanding of data engineering. 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 an Amazon SageMaker notebook to train a model using data from an S3 bucket. The IAM role attached to the notebook has the following policy. What is the MOST specific change needed to allow the notebook to read from the bucket 'ml-data-123'?
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
✓
Remove the Deny statement from the IAM policy.
The existing IAM policy includes an explicit Deny statement that blocks all s3:GetObject access to the bucket 'ml-data-123'. In IAM, an explicit Deny overrides any Allow, so even if other policies grant read access, the Deny prevents it. Removing the Deny statement is the most specific change because it eliminates the blocking condition without requiring additional permissions or resources.
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.
- ✗
Add an Allow statement for 's3:GetObject' on 'ml-data-123' to the IAM policy.
Why it's wrong here
Explicit denies take precedence over allows; adding an allow does not remove the deny.
- ✓
Remove the Deny statement from the IAM policy.
Why this is correct
An explicit deny overrides any allow; removing the deny allows the existing S3 actions to work.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create an S3 access point and update the IAM policy to use the access point ARN.
Why it's wrong here
Access points provide granular access but do not override explicit denies in IAM.
- ✗
Add a bucket policy on 'ml-data-123' that grants access to the notebook's IAM role.
Why it's wrong here
The IAM role already has a Deny; adding a bucket policy does not override the explicit deny.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often focus on adding Allow permissions or alternative access methods (like access points or bucket policies) without recognizing that an explicit Deny in the IAM policy is the absolute blocker that must be removed first.
Detailed technical explanation
How to think about this question
IAM policy evaluation logic follows an explicit Deny override rule: if a policy contains an explicit Deny for an action, that Deny applies regardless of any Allow statements from the same or other policies. This is part of AWS's 'deny by default' security model, where the order of evaluation is: explicit Deny > Allow > implicit Deny. In practice, this means a single explicit Deny can block all access to a resource even if multiple Allow statements exist, making it a common source of unintended access failures.
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
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FAQ
Questions learners often ask
What does this MLS-C01 question test?
Data Engineering — This question tests Data Engineering — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Remove the Deny statement from the IAM policy. — The existing IAM policy includes an explicit Deny statement that blocks all s3:GetObject access to the bucket 'ml-data-123'. In IAM, an explicit Deny overrides any Allow, so even if other policies grant read access, the Deny prevents it. Removing the Deny statement is the most specific change because it eliminates the blocking condition without requiring additional permissions or resources.
What should I do if I get this MLS-C01 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: Jul 4, 2026
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