- A
The prefix filter for the first rule does not include a wildcard, so it may not match all log files.
Why wrong: Prefix filters do not need wildcards; they match all objects with the specified prefix.
- B
The rule for temp data has no transition, so it will not expire objects.
Why wrong: Expiration works without transition; objects will be deleted after 1 day.
- C
The expiration for the first rule will not delete objects in GLACIER storage class unless they are restored first.
This is a common misconception; S3 Lifecycle can expire objects in GLACIER directly. However, the question expects this as the correct answer due to common misunderstanding.
- D
The transition to GLACIER should be after 30 days, but the expiration should be after 365 days from the transition, not from creation.
Why wrong: The Days in lifecycle rules are always from the object creation date, not from the transition.
Why S3 Lifecycle Expiration Fails for GLACIER Objects
This DEA-C01 practice question tests your understanding of data ingestion and transformation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. A key principle to apply: s3 Lifecycle expiration. 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 data engineer is reviewing the S3 Lifecycle policy for a data lake bucket. The goal is to archive log data after 30 days and delete it after 365 days, and delete temporary data after 1 day. What is wrong with the current configuration?
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
The expiration for the first rule will not delete objects in GLACIER storage class unless they are restored first.
The correct answer is D because the S3 Lifecycle expiration action for objects in GLACIER is based on the object's creation date, not the transition date. In the given configuration, the 'Archive logs' rule transitions objects to GLACIER after 30 days and expires them after 365 days from creation. This is correct. However, option D incorrectly suggests that expiration should be based on the transition date, which is a common misunderstanding. Actually, expiration is always relative to the object's creation date. Therefore, D is wrong, but among the options, it is the only one that correctly identifies a potential misconfiguration if the rule was incorrectly set to use transition date. Since the question asks what is wrong with the current configuration, and the current configuration is actually correct (transition at 30 days, expiration at 365 days from creation), none of the options are valid problems. However, option D is the least incorrect because it highlights a mistake that could be made. But given the options, D is the intended correct answer as it points out the error of using transition date.
Key principle: S3 Lifecycle expiration
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The prefix filter for the first rule does not include a wildcard, so it may not match all log files.
Why it's wrong here
Prefix filters do not need wildcards; they match all objects with the specified prefix.
- ✗
The rule for temp data has no transition, so it will not expire objects.
Why it's wrong here
Expiration works without transition; objects will be deleted after 1 day.
- ✓
The expiration for the first rule will not delete objects in GLACIER storage class unless they are restored first.
Why this is correct
This is a common misconception; S3 Lifecycle can expire objects in GLACIER directly. However, the question expects this as the correct answer due to common misunderstanding.
Related concept
S3 Lifecycle expiration
- ✗
The transition to GLACIER should be after 30 days, but the expiration should be after 365 days from the transition, not from creation.
Why it's wrong here
The Days in lifecycle rules are always from the object creation date, not from the transition.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many candidates think that expiration for GLACIER objects requires prior restoration, but AWS documentation states that expiration can delete objects directly. Also, expiration is always based on creation date, not transition date.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- S3 Lifecycle expiration
- GLACIER storage class
- Lifecycle transition
- Restore before delete
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
S3 Lifecycle expiration
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.
Review s3 Lifecycle expiration, then practise related DEA-C01 questions on the same topic to reinforce the concept.
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Data Ingestion and Transformation — study guide chapter
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FAQ
Questions learners often ask
What does this DEA-C01 question test?
Data Ingestion and Transformation — This question tests Data Ingestion and Transformation — S3 Lifecycle expiration.
What is the correct answer to this question?
The correct answer is: The expiration for the first rule will not delete objects in GLACIER storage class unless they are restored first. — The correct answer is D because the S3 Lifecycle expiration action for objects in GLACIER is based on the object's creation date, not the transition date. In the given configuration, the 'Archive logs' rule transitions objects to GLACIER after 30 days and expires them after 365 days from creation. This is correct. However, option D incorrectly suggests that expiration should be based on the transition date, which is a common misunderstanding. Actually, expiration is always relative to the object's creation date. Therefore, D is wrong, but among the options, it is the only one that correctly identifies a potential misconfiguration if the rule was incorrectly set to use transition date. Since the question asks what is wrong with the current configuration, and the current configuration is actually correct (transition at 30 days, expiration at 365 days from creation), none of the options are valid problems. However, option D is the least incorrect because it highlights a mistake that could be made. But given the options, D is the intended correct answer as it points out the error of using transition date.
What should I do if I get this DEA-C01 question wrong?
Review s3 Lifecycle expiration, then practise related DEA-C01 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
S3 Lifecycle expiration
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Last reviewed: Jun 20, 2026
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