DEA-C01 Data Operations and Support Practice Question
A company uses Amazon S3 to store data for analytics. The data engineer needs to ensure that the S3 bucket is protected against accidental deletion of objects. Which THREE actions should the engineer take? (Choose 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
✓
Create an S3 bucket policy that explicitly denies the s3:DeleteObject action.
To protect against accidental deletion of objects in Amazon S3, three effective measures are: creating a bucket policy that explicitly denies the s3:DeleteObject action (option B), enabling versioning (option D), and enabling MFA Delete (option E). Option B ensures that no principal can delete objects unless an explicit allow overrides it. Option D preserves all object versions, allowing recovery of deleted objects. Option E requires multi-factor authentication for deletion operations, adding an extra security layer. Option A (server access logging) is for auditing, not prevention. Option C (lifecycle policy to Glacier) does not prevent deletion; it transitions objects to cheaper storage but objects can still be deleted by lifecycle rules or manually.
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 server access logging for the S3 bucket.
Why it's wrong here
Logs are for auditing, not prevention.
- ✓
Create an S3 bucket policy that explicitly denies the s3:DeleteObject action.
Why this is correct
Prevents any user from deleting objects.
- ✗
Configure a lifecycle policy to transition objects to Glacier.
Why it's wrong here
This does not prevent deletion.
- ✓
Enable versioning on the S3 bucket.
Why this is correct
Allows recovery of deleted objects.
- ✓
Enable MFA Delete on the S3 bucket.
Why this is correct
Requires MFA to delete objects.
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 |
Go deeper
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DEA-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DEA-C01 exam.