ISC Practice Question: Systems Security Implementation Verification And Validation
You are verifying the security configuration of an Amazon S3 bucket. Which S3 feature must be enabled to ensure that object deletions are reversible in case of accidental or malicious data loss?
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
✓
S3 Versioning
S3 Versioning allows for the retrieval of previous versions of an object, even after deletion.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
S3 Object Lock
Why it's wrong here
Object Lock prevents deletion for a duration, but is for immutability, not necessarily reversible deletion.
- ✗
S3 Block Public Access
Why it's wrong here
This prevents public exposure, not data loss via deletion.
- ✓
S3 Versioning
Why this is correct
Versioning preserves previous states of objects, effectively acting as a safeguard against data loss.
- ✗
S3 Lifecycle Policies
Why it's wrong here
Lifecycle policies manage the transition of objects to different storage classes or deletion, not recovery.
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 |
About these practice questions
One of 209 original ISC practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official (ISC)² exam blueprint
This ISC practice question is part of Courseiva's free (ISC)² 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 ISC exam.