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 startup uses Amazon S3 to store user-uploaded images. The images are accessed frequently for the first week after upload, but after that they are rarely accessed. The company wants to optimize storage costs without compromising availability. The data engineer must implement a lifecycle policy to transition objects to a more cost-effective storage class after 30 days. The objects must be retrievable within minutes. Which storage class should the engineer transition the objects to?
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.
S3 One Zone-Infrequent Access
Why wrong: Lower durability; suitable for non-critical data.
S3 Standard
Why wrong: Standard is more expensive for infrequently accessed data.
S3 Standard-Infrequent Access
Cost-effective for infrequent access with rapid retrieval.
S3 Glacier Instant Retrieval
Why wrong: Has a 90-day minimum storage charge; Standard-IA is better for 30-day transition.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
S3 Standard-Infrequent Access
S3 Standard-Infrequent Access (S3 Standard-IA) is the correct choice because it offers a per-GB storage cost lower than S3 Standard while maintaining high durability (99.999999999%) and availability (99.9%), with retrieval times in milliseconds. The lifecycle policy transitions objects after 30 days, aligning with the access pattern where images are rarely accessed after the first week, and the requirement for retrieval within minutes is satisfied by S3 Standard-IA's instant access.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
S3 One Zone-Infrequent Access
Why it's wrong here
Lower durability; suitable for non-critical data.
S3 Standard
Why it's wrong here
Standard is more expensive for infrequently accessed data.
S3 Standard-Infrequent Access
Why this is correct
Cost-effective for infrequent access with rapid retrieval.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
S3 Glacier Instant Retrieval
Why it's wrong here
Has a 90-day minimum storage charge; Standard-IA is better for 30-day transition.
Common exam traps
The trap here is that candidates confuse 'retrievable within minutes' with S3 Glacier Instant Retrieval, overlooking that S3 Standard-IA also provides immediate access and is more cost-effective for data that is rarely accessed but not archival, especially with a 30-day transition window that avoids the 90-day minimum storage charge of Glacier Instant Retrieval.
Detailed technical explanation
S3 Standard-IA uses a redundant storage layer across at least three Availability Zones, providing the same durability as S3 Standard but with a lower storage price (approximately $0.0125/GB vs $0.023/GB) in exchange for a retrieval fee ($0.01/GB) and a minimum object size charge (128 KB). Under the hood, S3 lifecycle policies evaluate objects based on last-modified date and can transition them atomically; the 30-day transition ensures objects are moved after the initial high-access period, but note that objects smaller than 128 KB will still be charged as 128 KB in S3 Standard-IA.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Data Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
The correct answer is: S3 Standard-Infrequent Access — S3 Standard-Infrequent Access (S3 Standard-IA) is the correct choice because it offers a per-GB storage cost lower than S3 Standard while maintaining high durability (99.999999999%) and availability (99.9%), with retrieval times in milliseconds. The lifecycle policy transitions objects after 30 days, aligning with the access pattern where images are rarely accessed after the first week, and the requirement for retrieval within minutes is satisfied by S3 Standard-IA's instant access.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 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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