- A
The S3 lifecycle rule is configured with a filter that does not match the prefix used by Kinesis Data Firehose.
Correct. If the lifecycle rule's filter (e.g., prefix, tags) does not match the prefix that Kinesis Data Firehose uses when writing objects, the rule will not be applied to those objects. Firehose typically writes objects with a date-based prefix, so ensure the rule filter matches that prefix.
- B
The Glacier Deep Archive storage class requires a minimum 90-day storage period, so the lifecycle policy cannot transition objects after 30 days.
Why wrong: Incorrect. While Glacier Deep Archive has a minimum 90-day storage charge, lifecycle rules can still transition objects to that storage class after 30 days. Early deletion will incur a penalty, but the transition itself is allowed.
- C
The S3 bucket is not enabled for S3 Intelligent-Tiering, which is required for lifecycle transitions to Glacier Deep Archive.
Why wrong: Incorrect. S3 Intelligent-Tiering is an optional storage class that automatically moves data between access tiers. It is not required for lifecycle transitions to Glacier Deep Archive.
- D
The S3 bucket does not have S3 Batch Operations enabled to invoke the lifecycle policy.
Why wrong: Incorrect. S3 Batch Operations is a feature for performing large-scale batch actions on objects, such as copying or restoring. Lifecycle policies are automatically evaluated by S3 and do not require Batch Operations.
DEA-C01 Data Store Management Practice Question
This DEA-C01 practice question tests your understanding of data store management. 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.
A startup is building a real-time analytics application using Amazon Kinesis Data Streams and Amazon Kinesis Data Analytics. The application processes clickstream data from a website. The data is also stored in Amazon S3 for historical analysis. The company uses an S3 bucket with a lifecycle policy that transitions objects to Amazon S3 Glacier Deep Archive after 30 days. The data engineering team has configured a Kinesis Data Firehose delivery stream to write data to the S3 bucket. The team notices that the data in S3 is not being transitioned to Glacier Deep Archive after 30 days. The lifecycle policy is correctly configured and has been verified. What is the most likely cause of this issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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 S3 lifecycle rule is configured with a filter that does not match the prefix used by Kinesis Data Firehose.
The most likely cause is that the S3 lifecycle rule has a filter that does not match the prefix used by Kinesis Data Firehose. Firehose writes objects with a specific prefix pattern (e.g., 'year/month/day/hour/...'), and if the lifecycle rule is configured with a different prefix filter, the rule will not apply to those objects. Option A is correct. Option B is incorrect because the minimum 90-day storage period for Glacier Deep Archive is a billing consideration, not a restriction on lifecycle transitions; objects can be transitioned after 30 days, but early deletion fees may apply. Option C is incorrect because S3 Intelligent-Tiering is not required for lifecycle transitions to Glacier Deep Archive; any S3 bucket can have lifecycle rules. Option D is incorrect because S3 Batch Operations are not involved in lifecycle transitions; they are used for bulk operations like copying or restoring objects.
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.
- ✓
The S3 lifecycle rule is configured with a filter that does not match the prefix used by Kinesis Data Firehose.
Why this is correct
Correct. If the lifecycle rule's filter (e.g., prefix, tags) does not match the prefix that Kinesis Data Firehose uses when writing objects, the rule will not be applied to those objects. Firehose typically writes objects with a date-based prefix, so ensure the rule filter matches that prefix.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The Glacier Deep Archive storage class requires a minimum 90-day storage period, so the lifecycle policy cannot transition objects after 30 days.
Why it's wrong here
Incorrect. While Glacier Deep Archive has a minimum 90-day storage charge, lifecycle rules can still transition objects to that storage class after 30 days. Early deletion will incur a penalty, but the transition itself is allowed.
- ✗
The S3 bucket is not enabled for S3 Intelligent-Tiering, which is required for lifecycle transitions to Glacier Deep Archive.
Why it's wrong here
Incorrect. S3 Intelligent-Tiering is an optional storage class that automatically moves data between access tiers. It is not required for lifecycle transitions to Glacier Deep Archive.
- ✗
The S3 bucket does not have S3 Batch Operations enabled to invoke the lifecycle policy.
Why it's wrong here
Incorrect. S3 Batch Operations is a feature for performing large-scale batch actions on objects, such as copying or restoring. Lifecycle policies are automatically evaluated by S3 and do not require Batch Operations.
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.
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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: The S3 lifecycle rule is configured with a filter that does not match the prefix used by Kinesis Data Firehose. — The most likely cause is that the S3 lifecycle rule has a filter that does not match the prefix used by Kinesis Data Firehose. Firehose writes objects with a specific prefix pattern (e.g., 'year/month/day/hour/...'), and if the lifecycle rule is configured with a different prefix filter, the rule will not apply to those objects. Option A is correct. Option B is incorrect because the minimum 90-day storage period for Glacier Deep Archive is a billing consideration, not a restriction on lifecycle transitions; objects can be transitioned after 30 days, but early deletion fees may apply. Option C is incorrect because S3 Intelligent-Tiering is not required for lifecycle transitions to Glacier Deep Archive; any S3 bucket can have lifecycle rules. Option D is incorrect because S3 Batch Operations are not involved in lifecycle transitions; they are used for bulk operations like copying or restoring objects.
What should I do if I get this DEA-C01 question wrong?
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jun 20, 2026
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.
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