- A
Move all objects to S3 Glacier Instant Retrieval immediately upon upload and disable lifecycle policies.
Why wrong: Glacier Instant Retrieval can be useful for frequent retrieval needs with low latency, but it is not the most cost-optimized option for data that is rarely accessed. Disabling lifecycle removes the ability to move older data to cheaper tiers.
- B
Use an S3 lifecycle policy to transition objects to S3 Glacier Deep Archive after 30 days, and expire them after 18 months.
Lifecycle policies can automatically move data to lower-cost storage classes after it becomes infrequently accessed. Because reads are rare and required only during investigations, Glacier Deep Archive is a strong cost-optimization choice. Setting expiration after 18 months ensures compliance retention is met.
- C
Keep objects in S3 Standard but compress them with a custom process to reduce storage size.
Why wrong: While compression may reduce object size, it introduces additional compute complexity and operational overhead. The biggest driver of storage cost is usually the storage class; transitioning to an archive tier provides a more direct and predictable cost reduction.
- D
Enable S3 Intelligent-Tiering for all objects and delete any object not accessed within 24 hours.
Why wrong: Intelligent-Tiering can help when access patterns are unpredictable, but deleting objects after 24 hours directly violates the stated compliance requirement to retain data for at least 18 months.
Quick Answer
The answer is to use an S3 lifecycle policy that transitions objects to S3 Glacier Deep Archive after 30 days and expires them after 18 months. This configuration is correct because S3 Glacier Deep Archive provides the absolute lowest storage cost for data with rare retrieval needs, such as compliance retention, while still meeting the 18-month retention requirement through a lifecycle expiration action. On the SAA-C03 exam, this scenario tests your ability to balance cost optimization against compliance mandates, often trapping candidates who choose S3 Glacier Instant Retrieval or fail to set a specific expiration date, mistakenly relying on manual deletion. Remember that for compliance retention with rare retrieval, you want the coldest storage class possible, and a lifecycle rule handles both the transition and the automatic deletion at the end of the retention window. A useful memory tip is "Deep for the deep freeze, expire to comply"—if you rarely need it and must delete it on schedule, Glacier Deep Archive with a lifecycle expiration is your go-to.
SAA-C03 Design Cost-Optimized Architectures Practice Question
This SAA-C03 practice question tests your understanding of design cost-optimized architectures. 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.
An S3 bucket stores user-uploaded media. Most objects are never read again, but compliance requires keeping them for at least 18 months. Retrieval is rare and typically only needed during investigations. The current design keeps everything in S3 Standard, increasing storage cost. Which configuration best optimizes cost while meeting the retention and rare-access requirements?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Clue:
"least"Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
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.
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
Use an S3 lifecycle policy to transition objects to S3 Glacier Deep Archive after 30 days, and expire them after 18 months.
Option B is correct because S3 Glacier Deep Archive offers the lowest storage cost for data that is rarely accessed and has a flexible retrieval time (12 hours for standard retrievals). The lifecycle policy transitions objects after 30 days to minimize Standard costs, and expiration after 18 months ensures compliance by deleting objects exactly when the retention period ends, avoiding manual cleanup.
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.
- ✗
Move all objects to S3 Glacier Instant Retrieval immediately upon upload and disable lifecycle policies.
Why it's wrong here
Glacier Instant Retrieval can be useful for frequent retrieval needs with low latency, but it is not the most cost-optimized option for data that is rarely accessed. Disabling lifecycle removes the ability to move older data to cheaper tiers.
- ✓
Use an S3 lifecycle policy to transition objects to S3 Glacier Deep Archive after 30 days, and expire them after 18 months.
Why this is correct
Lifecycle policies can automatically move data to lower-cost storage classes after it becomes infrequently accessed. Because reads are rare and required only during investigations, Glacier Deep Archive is a strong cost-optimization choice. Setting expiration after 18 months ensures compliance retention is met.
Clue confirmation
The clue words "best", "least", "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Keep objects in S3 Standard but compress them with a custom process to reduce storage size.
Why it's wrong here
While compression may reduce object size, it introduces additional compute complexity and operational overhead. The biggest driver of storage cost is usually the storage class; transitioning to an archive tier provides a more direct and predictable cost reduction.
- ✗
Enable S3 Intelligent-Tiering for all objects and delete any object not accessed within 24 hours.
Why it's wrong here
Intelligent-Tiering can help when access patterns are unpredictable, but deleting objects after 24 hours directly violates the stated compliance requirement to retain data for at least 18 months.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose S3 Glacier Instant Retrieval (Option A) thinking it balances cost and retrieval speed, but they overlook that Deep Archive is far cheaper for data that is almost never accessed, and that disabling lifecycle policies removes the ability to automate retention management.
Detailed technical explanation
How to think about this question
S3 Glacier Deep Archive has a retrieval time of 12 hours for standard restores, which aligns with the rare-access pattern (investigations can wait). The lifecycle policy uses the 'Transition' action to move objects to Deep Archive after 30 days, and the 'Expiration' action permanently deletes objects after 18 months, ensuring compliance without manual intervention. Under the hood, S3 lifecycle policies are evaluated daily, so there may be a slight delay in transitions, but the cost savings are significant—Deep Archive storage costs ~$0.00099/GB/month compared to Standard's ~$0.023/GB/month.
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
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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: Use an S3 lifecycle policy to transition objects to S3 Glacier Deep Archive after 30 days, and expire them after 18 months. — Option B is correct because S3 Glacier Deep Archive offers the lowest storage cost for data that is rarely accessed and has a flexible retrieval time (12 hours for standard retrievals). The lifecycle policy transitions objects after 30 days to minimize Standard costs, and expiration after 18 months ensures compliance by deleting objects exactly when the retention period ends, avoiding manual cleanup.
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: "best", "least", "never". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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