Quick Answer
The answer is the current date. This is correct because S3 lifecycle transitions are calculated based on the object’s age, which is determined by subtracting the last modified date from the current date. The CLI command shown provides the last modified date, but without knowing today’s date, you cannot compute whether the object has passed the minimum age threshold for a transition to S3 Glacier. On the AWS Certified Data Engineer Associate DEA-C01 exam, this concept tests your understanding that lifecycle policies rely on object age, not metadata like ContentLength or ETag—a common trap is assuming metadata fields themselves reveal eligibility. To avoid this, remember that age is always a delta between two dates: the object’s last modified timestamp and the current date. A quick memory tip: “Age needs today’s date—metadata only gives the birthday.”
This DEA-C01 practice question tests your understanding of data operations and support. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Refer to the exhibit. A data engineer runs this CLI command to check an object's metadata. The engineer wants to verify if the object is eligible for lifecycle transition to S3 Glacier based on its age. What additional information is needed?
The current date
The object age is based on LastModified and current date.
The ETag value
Why wrong: ETag is for integrity checks.
The metadata archive flag
Why wrong: Metadata does not indicate age.
The ContentLength value
Why wrong: File size is not needed for age-based 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
The current date
Option C is correct because the last modified date shows when the object was last modified, and lifecycle policies are based on object age. The engineer needs the current date to calculate the age. Option A is wrong because ContentLength is not relevant. Option B is wrong because ETag is for integrity. Option D is wrong because metadata is shown but not needed for age calculation.
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.
The current date
Why this is correct
The object age is based on LastModified and current date.
Related concept
Read the scenario before looking for a memorised answer.
The ETag value
Why it's wrong here
ETag is for integrity checks.
The metadata archive flag
Why it's wrong here
Metadata does not indicate age.
The ContentLength value
Why it's wrong here
File size is not needed for age-based transition.
Common exam traps
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
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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.
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FAQ
Data Operations and Support — This question tests Data Operations and Support — Read the scenario before looking for a memorised answer..
The correct answer is: The current date — Option C is correct because the last modified date shows when the object was last modified, and lifecycle policies are based on object age. The engineer needs the current date to calculate the age. Option A is wrong because ContentLength is not relevant. Option B is wrong because ETag is for integrity. Option D is wrong because metadata is shown but not needed for age calculation.
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.
Read the scenario before looking for a memorised answer.
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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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