The answer is to transition objects to S3 Standard-IA after 30 days, then to S3 Glacier Deep Archive after 120 days. This lifecycle policy directly maps to the described access pattern: S3 Standard provides immediate retrieval for the first 30 days of frequent access, while Standard-IA offers lower storage costs with the same millisecond retrieval for the next 90 days of rare access, and Glacier Deep Archive delivers the absolute lowest cost for long-term archival after day 120. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your ability to match storage class capabilities to access frequency and cost goals, with a common trap being selecting Glacier Flexible Retrieval for the rare-access phase—which incurs higher costs and retrieval delays compared to Standard-IA. Remember the memory tip: "30 days hot, 90 days warm, then deep freeze" to visualize the Standard to Standard-IA to Glacier Deep Archive progression.
DEA-C01 Data Store Management Practice Question
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 data engineer is configuring Amazon S3 Lifecycle policies to transition objects between storage classes. The data is accessed frequently for the first 30 days, then rarely for the next 90 days, after which it must be archived. The engineer wants to minimize costs while ensuring immediate retrieval for the first 30 days. Which lifecycle policy should the engineer implement?
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.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Transition to Standard-IA after 30 days, then to Glacier Deep Archive after 120 days
Option D is correct because it transitions objects from S3 Standard (immediate retrieval, frequent access) to S3 Standard-IA (lower cost for infrequent access, immediate retrieval) after 30 days, then to S3 Glacier Deep Archive (lowest-cost archival storage) after 120 days. This matches the access pattern: frequent for 30 days, rare for 90 days, then archived, while minimizing cost and maintaining immediate retrieval for the first 30 days.
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 Glacier Flexible Retrieval after 30 days, then delete after 120 days
Why it's wrong here
Glacier has retrieval delays; data still needs to be accessed rarely, not archived.
✗
Transition to One Zone-IA after 30 days, then to Glacier Deep Archive after 120 days
Why it's wrong here
One Zone-IA is less durable and not suitable if data loss is unacceptable.
✗
Transition to Glacier Deep Archive after 30 days, then delete after 120 days
Why it's wrong here
Immediate retrieval is needed for 30 days; Glacier Deep Archive has long retrieval times.
✓
Transition to Standard-IA after 30 days, then to Glacier Deep Archive after 120 days
Why this is correct
Standard-IA is cost-effective for rarely accessed data; Glacier Deep Archive is cheapest for archiving.
Clue confirmation
The clue words "first", "minimum / minimize" 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
The trap here is that candidates often choose Glacier Deep Archive too early (e.g., after 30 days) to minimize cost, forgetting that the data must be immediately retrievable for the first 30 days and rarely accessed but still retrievable for the next 90 days, which requires a storage class with immediate retrieval (Standard-IA) before archiving.
Detailed technical explanation
How to think about this question
S3 Lifecycle policies evaluate objects based on their creation date and apply transitions at the specified number of days after creation. The minimum transition period from S3 Standard to S3 Standard-IA is 30 days, and from S3 Standard-IA to S3 Glacier Deep Archive is 30 days (total 60 days), but the policy can be set to 120 days for the second transition. S3 Glacier Deep Archive has a retrieval time of 12-48 hours and is the lowest-cost storage class, ideal for long-term archival where immediate access is not required. In real-world scenarios, data engineers must balance retrieval time requirements with cost, and using Standard-IA for the rare-access period avoids the higher cost of Standard while still providing millisecond retrieval.
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.
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
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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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 Standard-IA after 30 days, then to Glacier Deep Archive after 120 days — Option D is correct because it transitions objects from S3 Standard (immediate retrieval, frequent access) to S3 Standard-IA (lower cost for infrequent access, immediate retrieval) after 30 days, then to S3 Glacier Deep Archive (lowest-cost archival storage) after 120 days. This matches the access pattern: frequent for 30 days, rare for 90 days, then archived, while minimizing cost and maintaining immediate retrieval for the first 30 days.
What should I do if I get this DEA-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "first", "minimum / minimize". 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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