- A
Enable MFA Delete on the bucket.
MFA Delete requires an additional authentication factor to permanently delete object versions, reducing accidental deletion risk.
- B
Create a lifecycle policy to transition objects to S3 Glacier.
Why wrong: Lifecycle policies can actually cause data loss if they delete objects prematurely.
- C
Enable server-side encryption on the bucket.
Why wrong: Encryption protects data at rest but does not prevent deletion or loss.
- D
Configure cross-region replication to a destination bucket.
Replication creates a copy of objects in another region, protecting against regional disasters and accidental deletion.
- E
Enable versioning on the bucket.
Versioning retains all versions of objects, allowing recovery from accidental overwrites or deletions.
SOA-C02 Reliability and Business Continuity Practice Question
This SOA-C02 practice question tests your understanding of reliability and business continuity. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Which THREE measures help protect an S3 bucket from accidental data loss? (Choose 3)
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 MFA Delete on the bucket.
Option A is correct because enabling MFA Delete on an S3 bucket requires multi-factor authentication for any delete operations, adding an extra layer of protection against accidental or unauthorized deletion of objects. This helps prevent data loss by ensuring that even if credentials are compromised, a delete action cannot be performed without the MFA token.
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.
- ✓
Enable MFA Delete on the bucket.
Why this is correct
MFA Delete requires an additional authentication factor to permanently delete object versions, reducing accidental deletion risk.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a lifecycle policy to transition objects to S3 Glacier.
Why it's wrong here
Lifecycle policies can actually cause data loss if they delete objects prematurely.
- ✗
Enable server-side encryption on the bucket.
Why it's wrong here
Encryption protects data at rest but does not prevent deletion or loss.
- ✓
Configure cross-region replication to a destination bucket.
Why this is correct
Replication creates a copy of objects in another region, protecting against regional disasters and accidental deletion.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Enable versioning on the bucket.
Why this is correct
Versioning retains all versions of objects, allowing recovery from accidental overwrites or deletions.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse data protection features like encryption or lifecycle policies with data durability and accidental deletion prevention, leading them to select options that secure data but do not prevent loss from deletion.
Detailed technical explanation
How to think about this question
MFA Delete works by requiring the x-amz-mfa header in DELETE requests, which includes a serial number and a one-time code from a hardware or virtual MFA device. Versioning must be enabled on the bucket before MFA Delete can be turned on, and once enabled, even the root user cannot delete objects without MFA. Cross-region replication (CRR) provides an independent copy in a different AWS region, so if the source bucket experiences accidental deletion or corruption, the replicated data remains intact.
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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Reliability and Business Continuity — study guide chapter
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
Reliability and Business Continuity — This question tests Reliability and Business Continuity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable MFA Delete on the bucket. — Option A is correct because enabling MFA Delete on an S3 bucket requires multi-factor authentication for any delete operations, adding an extra layer of protection against accidental or unauthorized deletion of objects. This helps prevent data loss by ensuring that even if credentials are compromised, a delete action cannot be performed without the MFA token.
What should I do if I get this SOA-C02 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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