- A
Leave logs in S3 Standard for 18 months and add a tag for internal reporting
Why wrong: Tagging does not reduce storage cost; the logs still remain in the most expensive class.
- B
Create an S3 lifecycle policy to transition logs to Standard-IA after 30 days and to Glacier Deep Archive after 180 days
Storage class transitions align cost with access frequency while still keeping objects for the full compliance period.
- C
Immediately move all logs to Glacier Instant Retrieval and expire after 18 months
Why wrong: Instant Retrieval can be useful, but moving all logs immediately increases retrieval cost and may be inefficient for hot first-30-day access.
- D
Enable versioning and rely on object lifecycle expiration to reduce costs; do not change storage classes
Why wrong: Versioning and expiration may change storage volume but it does not address the primary cost driver: storage class.
SAA-C03 Design Cost-Optimized Architectures Practice Question
This SAA-C03 practice question tests your understanding of design cost-optimized architectures. 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 team stores application logs in an S3 bucket. They keep logs for 18 months for compliance. Access patterns: logs are heavily accessed during the first 30 days, rarely accessed between days 31 and 180, and almost never accessed after day 180. They currently store everything in S3 Standard and want to reduce storage cost without violating the 18-month retention requirement. What should they implement?
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.
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
Create an S3 lifecycle policy to transition logs to Standard-IA after 30 days and to Glacier Deep Archive after 180 days
Option B is correct because an S3 lifecycle policy can automatically transition objects from S3 Standard to S3 Standard-IA after 30 days (matching the heavy-access period) and then to S3 Glacier Deep Archive after 180 days (matching the near-zero-access period). This minimizes storage costs while retaining logs for the required 18 months, as Glacier Deep Archive offers the lowest storage cost for long-term archival data.
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.
- ✗
Leave logs in S3 Standard for 18 months and add a tag for internal reporting
Why it's wrong here
Tagging does not reduce storage cost; the logs still remain in the most expensive class.
- ✓
Create an S3 lifecycle policy to transition logs to Standard-IA after 30 days and to Glacier Deep Archive after 180 days
Why this is correct
Storage class transitions align cost with access frequency while still keeping objects for the full compliance period.
Clue confirmation
The clue words "first", "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Immediately move all logs to Glacier Instant Retrieval and expire after 18 months
Why it's wrong here
Instant Retrieval can be useful, but moving all logs immediately increases retrieval cost and may be inefficient for hot first-30-day access.
- ✗
Enable versioning and rely on object lifecycle expiration to reduce costs; do not change storage classes
Why it's wrong here
Versioning and expiration may change storage volume but it does not address the primary cost driver: storage class.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose Option C, mistakenly thinking Glacier Instant Retrieval is the cheapest archival class, but it is actually more expensive than Glacier Deep Archive for data that is almost never accessed, and the immediate transition ignores the cost savings from using Standard-IA during the first 30 days.
Detailed technical explanation
How to think about this question
S3 lifecycle policies evaluate objects based on their creation date and can transition to lower-cost storage classes (e.g., Standard-IA after 30 days, Glacier Deep Archive after 180 days) with a minimum 30-day transition interval between non-current tiers. Glacier Deep Archive has a retrieval time of 12–48 hours and a minimum storage duration of 180 days, making it ideal for data that is almost never accessed but must be retained for compliance. The 18-month retention is achieved by setting an expiration action after 18 months (547 days) to delete the objects automatically.
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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: Create an S3 lifecycle policy to transition logs to Standard-IA after 30 days and to Glacier Deep Archive after 180 days — Option B is correct because an S3 lifecycle policy can automatically transition objects from S3 Standard to S3 Standard-IA after 30 days (matching the heavy-access period) and then to S3 Glacier Deep Archive after 180 days (matching the near-zero-access period). This minimizes storage costs while retaining logs for the required 18 months, as Glacier Deep Archive offers the lowest storage cost for long-term archival data.
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". 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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