SAA-C03 Design Cost-Optimized Architectures Practice Question
A company stores application logs in an S3 bucket. They retain logs for 180 days. Compliance requires that the logs be immutable once written, but the business only reviews logs about once per month. Currently, the team stores everything in S3 Standard, and their monthly S3 bill is too high. They want to reduce storage cost without changing the requirement to keep logs for 180 days.
Which lifecycle approach best meets the goal?
⚠ Common exam trap
Test-takers frequently choose S3 Intelligent-Tiering (Option C) thinking it automatically optimizes cost for all access patterns, but for logs accessed only once per month, S3 Standard-IA is more cost-effective because Intelligent-Tiering incurs monitoring and automation overhead and may not move objects to the cheapest tier quickly enough for this specific use case.
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 a lifecycle policy to transition objects older than 30 days to S3 Standard-IA, and keep them there until day 180.
It transitions logs older than 30 days to S3 Standard-IA, which offers lower storage costs than S3 Standard while still providing low-latency access for monthly reviews. The lifecycle policy keeps the objects in S3 Standard-IA until day 180, meeting the 180-day retention requirement without incurring the higher cost of S3 Standard for the entire period. S3 Standard-IA has a minimum storage duration of 30 days, which is satisfied by the 30-day transition threshold, and the objects remain immutable as S3 Object Lock is not affected by lifecycle transitions.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use a lifecycle policy to transition objects older than 30 days to S3 Standard-IA, and keep them there until day 180.
Why this is correct
Logs accessed about monthly match Standard-IA economics and still provide fast retrieval.
- ✗
Use a lifecycle policy to transition objects older than 30 days to S3 Glacier Deep Archive and delete after 30 days.
Why it's wrong here
Deep Archive is cheaper, but deletion after 30 days violates the 180-day retention requirement.
When this WOULD be correct
This option would be correct if the requirement was to retain logs for only 30 days and compliance allowed deletion after that period, with no need for frequent access.
- ✗
Use a lifecycle policy to transition objects older than 30 days to S3 Intelligent-Tiering with no minimum storage duration.
Why it's wrong here
Intelligent-Tiering can help, but removing a minimum duration is not necessary and adds complexity versus a clear monthly-access pattern.
When this WOULD be correct
A company stores data with unknown or changing access patterns (e.g., user-generated content) and wants to automatically optimize costs without manual lifecycle rules. They need no minimum storage duration and can tolerate potential retrieval costs if data is accessed frequently.
- ✗
Disable lifecycle management and instead lower costs by deleting objects immediately after they are written.
Why it's wrong here
Deleting immediately reduces cost but directly breaks the required 180-day retention and immutability needs.
When this WOULD be correct
If the compliance requirement was removed and the business only needed logs for a very short period (e.g., 24 hours) for immediate troubleshooting, deleting objects immediately after writing would minimize storage costs.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SAA-C03 exam frequently reuses these exact scenarios with slightly different constraints.
✓Use a lifecycle policy to transition objects older than 30 days to S3 Standard-IA, and keep them there until day 180.Correct answer▾
Why this is correct
Logs accessed about monthly match Standard-IA economics and still provide fast retrieval.
✗Use a lifecycle policy to transition objects older than 30 days to S3 Glacier Deep Archive and delete after 30 days.Wrong answer — click to see why▾
Why this is wrong here
Option B deletes objects after 30 days, failing the requirement to retain logs for 180 days. Additionally, Glacier Deep Archive is not suitable for logs reviewed monthly due to retrieval times of 12-48 hours.
★ When this WOULD be the correct answer
This option would be correct if the requirement was to retain logs for only 30 days and compliance allowed deletion after that period, with no need for frequent access.
Why candidates choose this
Candidates may think Glacier Deep Archive is the cheapest storage and overlook the 180-day retention requirement, focusing only on cost reduction.
✗Use a lifecycle policy to transition objects older than 30 days to S3 Intelligent-Tiering with no minimum storage duration.Wrong answer — click to see why▾
Why this is wrong here
S3 Intelligent-Tiering has a minimum storage duration charge of 30 days for objects moved to the infrequent access tiers, and it does not guarantee immutability; it is designed for unpredictable access patterns, not for reducing costs on logs that are rarely accessed after 30 days but must be retained for 180 days.
★ When this WOULD be the correct answer
A company stores data with unknown or changing access patterns (e.g., user-generated content) and wants to automatically optimize costs without manual lifecycle rules. They need no minimum storage duration and can tolerate potential retrieval costs if data is accessed frequently.
Why candidates choose this
Candidates may think Intelligent-Tiering automatically saves costs without needing to specify transitions, but they overlook the minimum storage duration charge and that it is not optimal for data with a predictable, low-access pattern after a known period.
✗Disable lifecycle management and instead lower costs by deleting objects immediately after they are written.Wrong answer — click to see why▾
Why this is wrong here
Deleting objects immediately violates the compliance requirement that logs be immutable once written and retained for 180 days.
★ When this WOULD be the correct answer
If the compliance requirement was removed and the business only needed logs for a very short period (e.g., 24 hours) for immediate troubleshooting, deleting objects immediately after writing would minimize storage costs.
Why candidates choose this
Candidates may think immediate deletion is the simplest way to reduce costs, overlooking the immutable retention and 180-day retention requirements.
Analysis generated from the official SAA-C03blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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 |
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SAA-C03 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 SAA-C03 exam.