- A
Keep all objects in S3 Standard permanently to avoid lifecycle transition fees.
Why wrong: Keeping objects in S3 Standard does not reduce storage cost. Lifecycle transitions are specifically designed to move infrequently accessed data to lower-cost storage classes after a delay. Even if there are per-transition request costs, the ongoing savings from using a cheaper storage class for the long retention period typically outweigh those transition request costs.
- B
After 30 days, transition objects to S3 Glacier Instant Retrieval, and after 18 months, expire (delete) the objects.
The prompt requires (1) cost reduction for data that becomes infrequently accessed and (2) quick retrieval when accessed again, and (3) a minimum retention of at least 18 months. Glacier Instant Retrieval is intended for data that is accessed occasionally and needs fast retrieval. Transitioning after 30 days moves the long-term, rarely accessed portion of the data to a cheaper class, while expiring at 18 months satisfies the explicit retention requirement (the objects remain for at least 18 months).
- C
After 30 days, transition objects to S3 Intelligent-Tiering, and set expiration to 12 months.
Why wrong: Intelligent-Tiering can reduce cost when access patterns are unpredictable, but the expiration setting must still meet the business retention requirement. Expiring at 12 months violates the requirement to retain objects for at least 18 months, so this option would fail compliance.
- D
After 30 days, transition objects to S3 Glacier Deep Archive, and set expiration to 18 months.
Why wrong: Deep Archive is generally the lowest-cost option for data that is extremely rarely accessed, but it has much slower restore times compared with Instant Retrieval. Because the prompt states that when accessed, objects must be retrievable quickly (minutes to a few hours), Deep Archive is not the best fit even though it would satisfy the 18-month retention requirement and would reduce cost.
Quick Answer
The answer is to transition objects to S3 Glacier Instant Retrieval after 30 days and then expire them after 18 months. This configuration is correct because S3 Glacier Instant Retrieval is specifically designed for rarely accessed data that still requires millisecond retrieval, perfectly matching the requirement that objects be retrievable within minutes to a few hours. The 30-day initial period in S3 Standard handles the brief upload spike, while the 18-month expiration enforces the retention policy without incurring unnecessary storage costs. On the SAA-C03 exam, this scenario tests your ability to distinguish between S3 storage classes based on retrieval time and cost, with a common trap being to choose S3 Glacier Flexible Retrieval (which has minutes-to-hours retrieval) or S3 Standard-IA (which lacks the deep cost savings for 18-month retention). Remember the key pairing: if the question says "rarely accessed" but still requires "instant" or "minutes" retrieval, your answer is Glacier Instant Retrieval. A useful memory tip is "Rare but Ready" — rare access, instant readiness.
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.
A company stores user uploads in an S3 bucket. Objects are accessed rarely after upload, but when an object is accessed, it must be retrievable quickly (minutes to a few hours). Objects must be retained for at least 18 months. The team wants to reduce storage cost while meeting these requirements. Which lifecycle configuration best fits these 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.
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
After 30 days, transition objects to S3 Glacier Instant Retrieval, and after 18 months, expire (delete) the objects.
Option B is correct because it transitions objects to S3 Glacier Instant Retrieval after 30 days, which provides millisecond retrieval for rarely accessed data, meeting the quick retrieval requirement. The 18-month expiration ensures compliance with the retention policy while minimizing storage costs compared to keeping data in S3 Standard.
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.
- ✗
Keep all objects in S3 Standard permanently to avoid lifecycle transition fees.
Why it's wrong here
Keeping objects in S3 Standard does not reduce storage cost. Lifecycle transitions are specifically designed to move infrequently accessed data to lower-cost storage classes after a delay. Even if there are per-transition request costs, the ongoing savings from using a cheaper storage class for the long retention period typically outweigh those transition request costs.
- ✓
After 30 days, transition objects to S3 Glacier Instant Retrieval, and after 18 months, expire (delete) the objects.
Why this is correct
The prompt requires (1) cost reduction for data that becomes infrequently accessed and (2) quick retrieval when accessed again, and (3) a minimum retention of at least 18 months. Glacier Instant Retrieval is intended for data that is accessed occasionally and needs fast retrieval. Transitioning after 30 days moves the long-term, rarely accessed portion of the data to a cheaper class, while expiring at 18 months satisfies the explicit retention requirement (the objects remain for at least 18 months).
Clue confirmation
The clue words "best", "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
After 30 days, transition objects to S3 Intelligent-Tiering, and set expiration to 12 months.
Why it's wrong here
Intelligent-Tiering can reduce cost when access patterns are unpredictable, but the expiration setting must still meet the business retention requirement. Expiring at 12 months violates the requirement to retain objects for at least 18 months, so this option would fail compliance.
- ✗
After 30 days, transition objects to S3 Glacier Deep Archive, and set expiration to 18 months.
Why it's wrong here
Deep Archive is generally the lowest-cost option for data that is extremely rarely accessed, but it has much slower restore times compared with Instant Retrieval. Because the prompt states that when accessed, objects must be retrievable quickly (minutes to a few hours), Deep Archive is not the best fit even though it would satisfy the 18-month retention requirement and would reduce cost.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse retrieval time requirements: S3 Glacier Deep Archive is cheaper but has retrieval times of hours, not minutes, and S3 Intelligent-Tiering is for unpredictable access, not for data that is rarely accessed after upload.
Detailed technical explanation
How to think about this question
S3 Glacier Instant Retrieval is optimized for long-lived, rarely accessed data that still needs millisecond retrieval, making it ideal for archives that may be accessed occasionally. The lifecycle policy transitions objects after 30 days to avoid the S3 Standard minimum storage charge (30 days), and the 18-month expiration ensures objects are deleted after the retention period, preventing unnecessary storage costs. Under the hood, S3 lifecycle transitions are asynchronous and billed per object, so the 30-day wait avoids the S3 Standard minimum storage duration penalty.
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: After 30 days, transition objects to S3 Glacier Instant Retrieval, and after 18 months, expire (delete) the objects. — Option B is correct because it transitions objects to S3 Glacier Instant Retrieval after 30 days, which provides millisecond retrieval for rarely accessed data, meeting the quick retrieval requirement. The 18-month expiration ensures compliance with the retention policy while minimizing storage costs compared to keeping data in S3 Standard.
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". 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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