← DEA-C01·Amazon Web Services

Question 664 of 1,786

Data Store Management →mediumMultiple ChoiceObjective-mapped

S3 Lifecycle with Versioning — Transition Noncurrent Versions

This DEA-C01 practice question tests your understanding of data store management. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.

A media company stores video files in Amazon S3 buckets organized by content type. The company has a requirement to automatically archive files that are older than 90 days to Amazon S3 Glacier Deep Archive to reduce costs. However, the company wants to retain the ability to restore files within 12 hours if needed. The data engineer creates an S3 Lifecycle policy to transition objects to Glacier Deep Archive after 90 days. After deploying the policy, the engineer notices that the storage costs have not decreased significantly. On reviewing the bucket metrics, the engineer sees that many objects are being deleted directly by users before the lifecycle policy takes effect. The company needs to enforce the lifecycle policy and prevent premature deletions. What should the data engineer do to enforce the lifecycle policy?

A
Apply an S3 Object Lock retention policy with a default retention mode of GOVERNANCE and a retention period of 90 days.
Why wrong: Object Lock prevents any deletion or modification during the retention period, which may conflict with business needs.
B
Enable S3 Versioning on the bucket and add a lifecycle rule to transition noncurrent versions to Glacier Deep Archive after 90 days.
Versioning preserves deleted objects as noncurrent versions, which can then be transitioned by lifecycle rules.
C
Enable S3 Multi-Factor Authentication (MFA) Delete on the bucket to require MFA for all delete operations.
Why wrong: MFA Delete does not prevent deletions; it adds an authentication step.
D
Use S3 Glacier Select to query the objects and restore them if needed.
Why wrong: Glacier Select is for querying data in place, not for lifecycle management.

Full breakdown with real-world context →

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 Versioning on the bucket and add a lifecycle rule to transition noncurrent versions to Glacier Deep Archive after 90 days.

Option B is correct because enabling S3 Versioning ensures that when users delete objects, a delete marker is created instead of permanently deleting the object. The lifecycle rule can then transition the noncurrent versions (the original objects) to Glacier Deep Archive after 90 days, preserving the data while reducing costs. Option A is incorrect because Object Lock with GOVERNANCE mode prevents any deletion or overwrite for the retention period, which may interfere with normal operations and does not address the lifecycle policy enforcement. Option C is incorrect because MFA Delete provides additional security for delete operations but does not prevent the deletion itself; it only requires MFA authentication. Option D is incorrect because S3 Glacier Select is used to query archived data, not for lifecycle management.

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.

✗
Apply an S3 Object Lock retention policy with a default retention mode of GOVERNANCE and a retention period of 90 days.
Why it's wrong here
Object Lock prevents any deletion or modification during the retention period, which may conflict with business needs.
✓
Enable S3 Versioning on the bucket and add a lifecycle rule to transition noncurrent versions to Glacier Deep Archive after 90 days.
Why this is correct
Versioning preserves deleted objects as noncurrent versions, which can then be transitioned by lifecycle rules.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable S3 Multi-Factor Authentication (MFA) Delete on the bucket to require MFA for all delete operations.
Why it's wrong here
MFA Delete does not prevent deletions; it adds an authentication step.
✗
Use S3 Glacier Select to query the objects and restore them if needed.
Why it's wrong here
Glacier Select is for querying data in place, not for lifecycle management.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

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.
Use explanations to understand the rule behind the answer.

TExam Day Tips

Underline the problem statement mentally.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.

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 DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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FAQ

Questions learners often ask

What does this DEA-C01 question test?

Data Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Enable S3 Versioning on the bucket and add a lifecycle rule to transition noncurrent versions to Glacier Deep Archive after 90 days. — Option B is correct because enabling S3 Versioning ensures that when users delete objects, a delete marker is created instead of permanently deleting the object. The lifecycle rule can then transition the noncurrent versions (the original objects) to Glacier Deep Archive after 90 days, preserving the data while reducing costs. Option A is incorrect because Object Lock with GOVERNANCE mode prevents any deletion or overwrite for the retention period, which may interfere with normal operations and does not address the lifecycle policy enforcement. Option C is incorrect because MFA Delete provides additional security for delete operations but does not prevent the deletion itself; it only requires MFA authentication. Option D is incorrect because S3 Glacier Select is used to query archived data, not for lifecycle management.

What should I do if I get this DEA-C01 question wrong?

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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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.