SAA-C03 Design Cost-Optimized Architectures Practice Question
A financial services company stores monthly regulatory reports in an Amazon S3 bucket. The reports are accessed frequently for the first 60 days after creation for audits and internal review. After that period, they are almost never accessed but must be retained for seven years and retrieved within 12 hours if a regulator requests them. The compliance team requires that the objects remain in a single bucket and that retrieval costs be minimized. Which storage solution meets these requirements MOST cost-effectively?
⚠ Common exam trap
The trap here is conflating Glacier Instant Retrieval with Glacier Flexible Retrieval, since the word Glacier appears in both but only the flexible class is appropriate when hours, not milliseconds, are acceptable for retrieval.
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
✓
Apply a lifecycle policy that transitions objects to S3 Glacier Flexible Retrieval after 60 days.
The objects are hot for 60 days and then cold for years, with a retrieval-time requirement measured in hours rather than milliseconds. A lifecycle transition to S3 Glacier Flexible Retrieval after 60 days matches that pattern: it lowers storage cost for the long retention period and its standard retrieval completes well within 12 hours. Keeping everything in a single bucket is supported because lifecycle rules operate within the bucket.
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 S3 Intelligent-Tiering and let it move objects between frequent and infrequent access tiers automatically.
Why it's wrong here
S3 Intelligent-Tiering monitors access patterns and moves objects between access tiers, but it charges a small monthly monitoring and automation fee per object. For a predictable pattern where objects are known to become cold after 60 days, a lifecycle rule is more cost-effective. Intelligent-Tiering also does not automatically move data to the deepest archive tiers unless the optional archive access tiers are enabled, adding complexity.
- ✗
Keep all objects in S3 Standard and rely on S3 Versioning to reduce storage charges over time.
Why it's wrong here
S3 Versioning retains multiple versions of an object, which increases rather than decreases storage consumption and therefore cost. S3 Standard is the most expensive general-purpose storage class for long-term retention, and keeping seven years of reports there ignores the fact that the objects are almost never accessed after 60 days, so this option does not meet the cost-optimization requirement.
- ✓
Apply a lifecycle policy that transitions objects to S3 Glacier Flexible Retrieval after 60 days.
Why this is correct
S3 Glacier Flexible Retrieval is an archive class that supports retrieval in minutes to hours, and its Standard retrieval option completes within 3 to 5 hours, comfortably inside the 12-hour requirement. It has lower storage cost than S3 Standard and Glacier Instant Retrieval, so transitioning objects after the 60-day active period minimizes cost while meeting the retrieval and retention requirements.
- ✗
Apply a lifecycle policy that transitions objects to S3 Glacier Instant Retrieval after 60 days.
Why it's wrong here
S3 Glacier Instant Retrieval is designed for archive data that needs millisecond retrieval, and it costs more per gigabyte than the flexible or deep archive classes. The requirement is retrieval within 12 hours, not milliseconds, so paying for instant retrieval capability is unnecessary. This class is a poor fit for the stated access pattern and retrieval time objective.
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 |
Go deeper
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Amazon Web Services exam blueprint
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.