This DEA-C01 practice question tests your understanding of data store management. 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. 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 data engineer is designing a data lake on Amazon S3. The data is accessed frequently for the first 30 days, then rarely accessed after 90 days, and must be archived after 1 year. Which S3 lifecycle policy configuration meets these requirements with the lowest cost?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Transition to S3 Standard-IA after 30 days, then to S3 Glacier Deep Archive after 365 days.
Option B is correct because it transitions to S3 Standard-IA after 30 days (cost-effective for infrequent access) and to S3 Glacier Deep Archive after 365 days (lowest cost archival). Option A transitions to S3 One Zone-IA, which is not recommended for durability. Option C transitions to S3 Glacier Flexible Retrieval, which costs more than Deep Archive. Option D transitions to S3 Glacier Instant Retrieval, which is expensive for archival.
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.
✗
Transition to S3 One Zone-IA after 30 days, then to S3 Glacier Deep Archive after 365 days.
Why it's wrong here
One Zone-IA is not durable enough for a data lake.
✗
Transition to S3 Glacier Flexible Retrieval after 90 days.
Why it's wrong here
Glacier Flexible Retrieval is more expensive than Deep Archive for long-term archival.
✗
Transition to S3 Glacier Instant Retrieval after 30 days, then expire after 365 days.
Why it's wrong here
Glacier Instant Retrieval is for data accessed quarterly, not annually, and costs more.
✓
Transition to S3 Standard-IA after 30 days, then to S3 Glacier Deep Archive after 365 days.
Why this is correct
Standard-IA is cost-effective for infrequent access, and Deep Archive is the cheapest archival tier.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
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.
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.
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: Transition to S3 Standard-IA after 30 days, then to S3 Glacier Deep Archive after 365 days. — Option B is correct because it transitions to S3 Standard-IA after 30 days (cost-effective for infrequent access) and to S3 Glacier Deep Archive after 365 days (lowest cost archival). Option A transitions to S3 One Zone-IA, which is not recommended for durability. Option C transitions to S3 Glacier Flexible Retrieval, which costs more than Deep Archive. Option D transitions to S3 Glacier Instant Retrieval, which is expensive for archival.
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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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