Question 36 of 1,711
DEA-C01 Data Operations and Support Practice Question
A company is using Amazon S3 as a data lake. Data is ingested hourly from multiple sources. The data engineer needs to ensure that once an object is written to S3, it cannot be overwritten or deleted for 30 days. Which S3 feature should be used?
⚠ Common exam trap
Test-takers frequently confuse S3 Versioning with MFA Delete (which only protects version deletions, not overwrites) as a sufficient solution, overlooking that Object Lock is the only feature that enforces a time-based immutability lock against both overwrites and deletions.
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 Object Lock with a retention period of 30 days.
S3 Object Lock with a retention period of 30 days enforces a write-once-read-many (WORM) policy that prevents objects from being overwritten or deleted during the retention period. This meets the requirement exactly, as it applies to both new and existing objects when enabled on a versioning-enabled bucket.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use S3 Lifecycle policies to transition objects to Glacier after 30 days.
Why it's wrong here
Does not prevent deletion or overwrite.
- ✗
Enable S3 Versioning and MFA Delete.
Why it's wrong here
Versioning allows overwrites, MFA Delete only protects against delete.
- ✗
Configure a bucket policy that denies s3:DeleteObject for all principals.
Why it's wrong here
Does not prevent overwrites.
- ✓
Enable S3 Object Lock with a retention period of 30 days.
Why this is correct
Object Lock enforces write-once-read-many (WORM) protection.
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 |
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Last reviewed: Jul 4, 2026
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.
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