- A
Transition objects to S3 Standard-IA after 30 days.
Standard-IA is appropriate once logs are no longer read frequently but still need fast retrieval. Moving after the heavy-access period lowers storage cost while keeping objects available for occasional reads.
- B
Transition objects to S3 Glacier Flexible Retrieval after 90 days.
Glacier Flexible Retrieval is designed for infrequent access and lower storage cost when retrieval can tolerate minutes to hours. That matches the scenario after the first three months.
- C
Expire objects after 400 days.
Expiration after the retention requirement ends prevents paying for storage beyond the required audit window. That is a direct and valid lifecycle cost-saving measure.
- D
Keep all objects in S3 Standard for the full retention period.
Why wrong: S3 Standard is the most expensive of the listed storage choices for long-lived, rarely accessed logs. Keeping everything in Standard ignores the clear decline in access frequency.
- E
Transition objects to S3 One Zone-IA after 30 days.
Why wrong: One Zone-IA reduces cost, but it stores data in a single Availability Zone. For audit logs, that durability tradeoff is usually unnecessary and less appropriate than Standard-IA and Glacier.
SAA-C03 Design Cost-Optimized Architectures Practice Question
This SAA-C03 practice question tests your understanding of design cost-optimized architectures. 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.
A media company stores application logs in S3. The logs must be kept for 400 days. They are read heavily for the first 30 days, occasionally for the next 90 days, and almost never after that. Retrieval after the first 3 months can wait a few hours. Which three lifecycle actions should they use to minimize storage cost? Select three.
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:
"never"Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
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 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
Transition objects to S3 Standard-IA after 30 days.
Option A is correct because after the initial 30-day period of heavy reads, transitioning objects to S3 Standard-IA reduces storage costs while still providing low-latency retrieval for the occasional access needed over the next 90 days. S3 Standard-IA is designed for data accessed infrequently but requires rapid access when needed, making it cost-effective for this usage pattern.
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 objects to S3 Standard-IA after 30 days.
Why this is correct
Standard-IA is appropriate once logs are no longer read frequently but still need fast retrieval. Moving after the heavy-access period lowers storage cost while keeping objects available for occasional reads.
Clue confirmation
The clue words "first", "never", "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Transition objects to S3 Glacier Flexible Retrieval after 90 days.
Why this is correct
Glacier Flexible Retrieval is designed for infrequent access and lower storage cost when retrieval can tolerate minutes to hours. That matches the scenario after the first three months.
Clue confirmation
The clue words "first", "never", "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Expire objects after 400 days.
Why this is correct
Expiration after the retention requirement ends prevents paying for storage beyond the required audit window. That is a direct and valid lifecycle cost-saving measure.
Clue confirmation
The clue words "first", "never", "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Keep all objects in S3 Standard for the full retention period.
Why it's wrong here
S3 Standard is the most expensive of the listed storage choices for long-lived, rarely accessed logs. Keeping everything in Standard ignores the clear decline in access frequency.
- ✗
Transition objects to S3 One Zone-IA after 30 days.
Why it's wrong here
One Zone-IA reduces cost, but it stores data in a single Availability Zone. For audit logs, that durability tradeoff is usually unnecessary and less appropriate than Standard-IA and Glacier.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse S3 One Zone-IA with Standard-IA, not realizing that One Zone-IA lacks the multi-AZ resilience and is not appropriate for logs that must be retained for compliance or occasional retrieval.
Detailed technical explanation
How to think about this question
S3 lifecycle policies allow automated transitions between storage classes based on object age. S3 Standard-IA has a minimum 30-day storage charge and a per-GB retrieval fee, while S3 Glacier Flexible Retrieval (formerly Glacier) offers retrieval in minutes to hours and is ideal for data accessed almost never. The 400-day expiration ensures objects are deleted after the retention period, avoiding ongoing storage costs. Note that transitioning to Glacier Flexible Retrieval after 90 days aligns with the 'occasional access' window ending and the 'almost never' phase beginning.
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.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Cost-Optimized Architectures — This question tests Design Cost-Optimized Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Transition objects to S3 Standard-IA after 30 days. — Option A is correct because after the initial 30-day period of heavy reads, transitioning objects to S3 Standard-IA reduces storage costs while still providing low-latency retrieval for the occasional access needed over the next 90 days. S3 Standard-IA is designed for data accessed infrequently but requires rapid access when needed, making it cost-effective for this usage pattern.
What should I do if I get this SAA-C03 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", "never", "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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Last reviewed: Jun 11, 2026
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