DEA-C01 Data Store Management Practice Question
Which TWO actions can reduce the cost of an Amazon S3 bucket that stores infrequently accessed data? (Choose 2.)
⚠ Common exam trap
The DEA-C01 exam often tests the misconception that enabling versioning or replication reduces costs, when in fact both increase storage and transfer costs, while lifecycle policies and storage class transitions are the correct cost-saving mechanisms.
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 lifecycle policies to expire objects after a certain period
Lifecycle policies allow you to define rules that automatically expire (delete) objects after a specified period, which directly reduces storage costs by removing data that is no longer needed. For infrequently accessed data, deleting obsolete objects prevents paying for unnecessary storage over time.
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 cross-region replication
Why it's wrong here
Replication increases costs.
- ✗
Enable versioning to keep multiple versions
Why it's wrong here
Versioning increases costs.
- ✓
Use lifecycle policies to expire objects after a certain period
Why this is correct
Expiration deletes unneeded objects.
- ✗
Enable MFA Delete for extra security
Why it's wrong here
MFA Delete does not reduce cost.
- ✓
Transition objects to S3 Standard-IA after 30 days
Why this is correct
Standard-IA is cheaper for infrequent access.
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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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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