- A
S3 Standard
Why wrong: S3 Standard is designed for frequently accessed data and provides low latency and high throughput. It is not cost-effective for data that is rarely accessed over a decade, as the storage costs are much higher than archival classes.
- B
S3 Intelligent-Tiering
Why wrong: S3 Intelligent-Tiering automatically moves objects between access tiers based on usage patterns. While it can optimize costs for unknown or changing access patterns, it includes a monitoring and automation fee that makes it less economical for data that is known to be rarely accessed for long periods.
- C
S3 One Zone-IA
Why wrong: S3 One Zone-IA stores data in a single Availability Zone and is designed for infrequently accessed data. It has lower storage costs than Standard, but it does not provide the high durability (99.999999999%) needed for critical compliance records, and the retrieval costs are higher than Glacier Deep Archive for rare access.
- D
S3 Glacier Deep Archive
S3 Glacier Deep Archive is the lowest-cost S3 storage class, designed for long-term retention of data that is accessed extremely rarely (e.g., once or twice per year). It provides secure and durable storage with retrieval times of 12-48 hours, making it the most cost-effective choice for regulatory archives with a 10-year retention requirement.
CLF-C02 Cloud Technology and Services Practice Question
This CLF-C02 practice question tests your understanding of cloud technology and services. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 healthcare company needs to store patient medical records that must be retained for 10 years to comply with regulatory requirements. These records are accessed very rarely, only in the event of an audit or legal request. Which Amazon S3 storage class is the MOST cost-effective choice for this data?
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
S3 Glacier Deep Archive
S3 Glacier Deep Archive is the most cost-effective choice because it is designed for long-term retention of rarely accessed data with a retrieval time of 12–48 hours. The 10-year retention requirement and infrequent access pattern (only during audits or legal requests) align perfectly with this storage class, offering the lowest storage cost among S3 classes while still meeting compliance needs.
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.
- ✗
S3 Standard
Why it's wrong here
S3 Standard is designed for frequently accessed data and provides low latency and high throughput. It is not cost-effective for data that is rarely accessed over a decade, as the storage costs are much higher than archival classes.
When this WOULD be correct
A question where data requires immediate, frequent access (e.g., a web application serving user-generated content) and must be stored with low latency and high durability. For example: 'A media company needs to store video files that are accessed multiple times per day by users.'
- ✗
S3 Intelligent-Tiering
Why it's wrong here
S3 Intelligent-Tiering automatically moves objects between access tiers based on usage patterns. While it can optimize costs for unknown or changing access patterns, it includes a monitoring and automation fee that makes it less economical for data that is known to be rarely accessed for long periods.
When this WOULD be correct
A company stores customer transaction logs that are accessed frequently for the first 30 days, then accessed sporadically for the next year, and rarely thereafter. S3 Intelligent-Tiering would automatically move data between tiers based on changing access patterns, optimizing costs without manual intervention.
- ✗
S3 One Zone-IA
Why it's wrong here
S3 One Zone-IA stores data in a single Availability Zone and is designed for infrequently accessed data. It has lower storage costs than Standard, but it does not provide the high durability (99.999999999%) needed for critical compliance records, and the retrieval costs are higher than Glacier Deep Archive for rare access.
When this WOULD be correct
A company needs cost-effective storage for non-critical, easily reproducible data that can tolerate the loss of an Availability Zone, such as temporary backup copies or cached data that can be regenerated from primary sources.
- ✓
S3 Glacier Deep Archive
Why this is correct
S3 Glacier Deep Archive is the lowest-cost S3 storage class, designed for long-term retention of data that is accessed extremely rarely (e.g., once or twice per year). It provides secure and durable storage with retrieval times of 12-48 hours, making it the most cost-effective choice for regulatory archives with a 10-year retention requirement.
Related concept
Read the scenario before looking for a memorised answer.
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 CLF-C02 exam frequently reuses these exact scenarios with slightly different constraints.
✓S3 Glacier Deep ArchiveCorrect answer▾
Why this is correct
S3 Glacier Deep Archive is the lowest-cost S3 storage class, designed for long-term retention of data that is accessed extremely rarely (e.g., once or twice per year). It provides secure and durable storage with retrieval times of 12-48 hours, making it the most cost-effective choice for regulatory archives with a 10-year retention requirement.
✗S3 StandardWrong answer — click to see why▾
Why this is wrong here
S3 Standard is designed for frequently accessed data with low latency and high throughput, making it cost-ineffective for rarely accessed data that must be retained for 10 years. The storage cost is significantly higher than archival classes like S3 Glacier Deep Archive.
★ When this WOULD be the correct answer
A question where data requires immediate, frequent access (e.g., a web application serving user-generated content) and must be stored with low latency and high durability. For example: 'A media company needs to store video files that are accessed multiple times per day by users.'
Why candidates choose this
Candidates may default to S3 Standard as the default or most familiar storage class, overlooking the cost implications of long-term, rarely accessed data. They might not fully consider the trade-offs between access frequency and storage cost.
✗S3 Intelligent-TieringWrong answer — click to see why▾
Why this is wrong here
S3 Intelligent-Tiering is designed for data with unknown or changing access patterns, but this question specifies that records are accessed very rarely (only for audits/legal requests). Intelligent-Tiering incurs monitoring and automation fees that make it less cost-effective than S3 Glacier Deep Archive for data with predictable, infrequent access.
★ When this WOULD be the correct answer
A company stores customer transaction logs that are accessed frequently for the first 30 days, then accessed sporadically for the next year, and rarely thereafter. S3 Intelligent-Tiering would automatically move data between tiers based on changing access patterns, optimizing costs without manual intervention.
Why candidates choose this
Candidates may think Intelligent-Tiering is always the most cost-effective because it automatically optimizes costs, but they overlook the monitoring fees and that for truly archival data with no access pattern changes, a dedicated archival class is cheaper.
✗S3 One Zone-IAWrong answer — click to see why▾
Why this is wrong here
S3 One Zone-IA stores data in a single Availability Zone, which does not meet the durability and availability requirements for critical patient medical records that must be retained for 10 years. Regulatory compliance typically mandates multi-AZ redundancy to prevent data loss from zone failures.
★ When this WOULD be the correct answer
A company needs cost-effective storage for non-critical, easily reproducible data that can tolerate the loss of an Availability Zone, such as temporary backup copies or cached data that can be regenerated from primary sources.
Why candidates choose this
Candidates may choose S3 One Zone-IA because it offers lower storage costs than S3 Standard and S3 Standard-IA, and they overlook the single-AZ risk, assuming 'IA' (Infrequent Access) is sufficient for rarely accessed data without considering durability requirements.
Analysis generated from the official CLF-C02blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose S3 Glacier (Flexible Retrieval) instead of S3 Glacier Deep Archive, confusing the two, but the question specifically asks for the 'most cost-effective' option for data accessed 'very rarely' over a 10-year period, making Deep Archive the correct choice due to its lower storage cost and longer retrieval time.
Detailed technical explanation
How to think about this question
S3 Glacier Deep Archive uses a tape-based storage architecture under the hood, with retrieval times ranging from 12 to 48 hours via the 'Expedited' (1–5 minutes), 'Standard' (3–5 hours), or 'Bulk' (5–12 hours) retrieval tiers, though Bulk is the default for Deep Archive. The 10-year retention period may also require lifecycle policies to prevent accidental deletion, and the data is replicated across at least three geographically separate Availability Zones within the same AWS Region for 99.999999999% durability. A real-world scenario is a hospital storing MRI scans that must be retained for legal holds; using Glacier Deep Archive reduces storage costs by up to 90% compared to S3 Standard, but the retrieval time must be factored into audit response plans.
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 CLF-C02 question test?
Cloud Technology and Services — This question tests Cloud Technology and Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: S3 Glacier Deep Archive — S3 Glacier Deep Archive is the most cost-effective choice because it is designed for long-term retention of rarely accessed data with a retrieval time of 12–48 hours. The 10-year retention requirement and infrequent access pattern (only during audits or legal requests) align perfectly with this storage class, offering the lowest storage cost among S3 classes while still meeting compliance needs.
What should I do if I get this CLF-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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
This CLF-C02 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 CLF-C02 exam.
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