- A
Amazon S3 Standard
Why wrong: S3 Standard is designed for frequently accessed data and has a higher storage cost than S3 Standard-IA. Using it for data that is rarely accessed would increase costs unnecessarily.
- B
Amazon S3 Glacier Flexible Retrieval
Why wrong: S3 Glacier Flexible Retrieval is for archival data with retrieval times from minutes to hours. While it might meet the 24-hour requirement, it is not optimized for data that may need rapid access occasionally, and its retrieval cost structure is different. S3 Standard-IA is a better fit because it offers millisecond retrieval for infrequently accessed data at a lower storage cost than Standard.
- C
Amazon S3 Standard-Infrequent Access (S3 Standard-IA)
S3 Standard-IA is ideal for data that is accessed less frequently but requires rapid access when needed. It provides the same low-latency retrieval as S3 Standard at a lower storage cost, perfectly matching the requirement of retrievability within 24 hours while minimizing cost.
- D
Amazon S3 One Zone-Infrequent Access (S3 One Zone-IA)
Why wrong: S3 One Zone-IA stores data in a single Availability Zone, which means it is less durable and resilient. For compliance data that must be retained for years, durability across multiple AZs is important. Therefore, S3 Standard-IA is a more appropriate choice.
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 company collects sensor data from IoT devices and stores the data in Amazon S3. For the first 90 days, the data is accessed frequently for real-time analysis. After 90 days, the data is rarely accessed but must be retrievable within 24 hours for compliance audits. After 365 days, the data must be retained for legal purposes but can be deleted after 7 years. Which S3 storage class should the company use for the data from day 91 to day 365 to minimize storage costs while meeting the retrieval time requirement?
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:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
Amazon S3 Standard-Infrequent Access (S3 Standard-IA)
From day 91 to day 365, the data is rarely accessed but must be retrievable within 24 hours. Amazon S3 Standard-IA (S3 Standard-IA) is designed for infrequently accessed data that needs rapid access when required, with retrieval times in milliseconds, easily meeting the 24-hour requirement. It offers lower storage costs than S3 Standard while still providing high durability and low-latency retrieval, making it the most cost-effective choice for this period.
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.
- ✗
Amazon S3 Standard
Why it's wrong here
S3 Standard is designed for frequently accessed data and has a higher storage cost than S3 Standard-IA. Using it for data that is rarely accessed would increase costs unnecessarily.
When this WOULD be correct
A company needs to store data that is accessed frequently (multiple times per day) for the entire storage duration, with no requirement for lower-cost infrequent access storage. S3 Standard would be the correct choice for such a use case.
- ✗
Amazon S3 Glacier Flexible Retrieval
Why it's wrong here
S3 Glacier Flexible Retrieval is for archival data with retrieval times from minutes to hours. While it might meet the 24-hour requirement, it is not optimized for data that may need rapid access occasionally, and its retrieval cost structure is different. S3 Standard-IA is a better fit because it offers millisecond retrieval for infrequently accessed data at a lower storage cost than Standard.
When this WOULD be correct
A company stores archival data that is accessed less than once a year and can tolerate retrieval times of 1-5 minutes (expedited) or 3-5 hours (standard). The data must be retained for 10 years. Which S3 storage class minimizes costs?
- ✓
Amazon S3 Standard-Infrequent Access (S3 Standard-IA)
Why this is correct
S3 Standard-IA is ideal for data that is accessed less frequently but requires rapid access when needed. It provides the same low-latency retrieval as S3 Standard at a lower storage cost, perfectly matching the requirement of retrievability within 24 hours while minimizing cost.
Clue confirmation
The clue words "first", "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon S3 One Zone-Infrequent Access (S3 One Zone-IA)
Why it's wrong here
S3 One Zone-IA stores data in a single Availability Zone, which means it is less durable and resilient. For compliance data that must be retained for years, durability across multiple AZs is important. Therefore, S3 Standard-IA is a more appropriate choice.
When this WOULD be correct
A company stores non-critical, easily reproducible data that is accessed infrequently and can tolerate the loss of an Availability Zone, such as temporary backup copies or cached thumbnails, and wants to 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 CLF-C02 exam frequently reuses these exact scenarios with slightly different constraints.
✓Amazon S3 Standard-Infrequent Access (S3 Standard-IA)Correct answer▾
Why this is correct
S3 Standard-IA is ideal for data that is accessed less frequently but requires rapid access when needed. It provides the same low-latency retrieval as S3 Standard at a lower storage cost, perfectly matching the requirement of retrievability within 24 hours while minimizing cost.
✗Amazon S3 StandardWrong answer — click to see why▾
Why this is wrong here
Amazon S3 Standard is designed for frequently accessed data and has higher storage costs than S3 Standard-IA. For data accessed rarely after 90 days, S3 Standard would not minimize storage costs.
★ When this WOULD be the correct answer
A company needs to store data that is accessed frequently (multiple times per day) for the entire storage duration, with no requirement for lower-cost infrequent access storage. S3 Standard would be the correct choice for such a use case.
Why candidates choose this
Candidates may default to S3 Standard as the default storage class without considering the cost implications of storing rarely accessed data in a higher-cost tier.
✗Amazon S3 Glacier Flexible RetrievalWrong answer — click to see why▾
Why this is wrong here
Amazon S3 Glacier Flexible Retrieval has a retrieval time of minutes to hours, but the question requires retrieval within 24 hours. However, the cost for Glacier Flexible Retrieval is lower than S3 Standard-IA only for data that is accessed very rarely (e.g., once per year). For data accessed rarely but still needing retrieval within 24 hours, S3 Standard-IA is more cost-effective because it has no retrieval fees and lower minimum storage duration (30 days vs 90 days for Glacier).
★ When this WOULD be the correct answer
A company stores archival data that is accessed less than once a year and can tolerate retrieval times of 1-5 minutes (expedited) or 3-5 hours (standard). The data must be retained for 10 years. Which S3 storage class minimizes costs?
Why candidates choose this
Candidates may assume that any 'rarely accessed' data should go to Glacier, overlooking the retrieval time requirement of 24 hours and the fact that S3 Standard-IA is cheaper for data accessed every few months due to no retrieval costs.
✗Amazon S3 One Zone-Infrequent Access (S3 One Zone-IA)Wrong answer — click to see why▾
Why this is wrong here
S3 One Zone-IA does not provide the required durability across multiple Availability Zones, which is critical for compliance audits and legal retention where data must be protected against AZ failures.
★ When this WOULD be the correct answer
A company stores non-critical, easily reproducible data that is accessed infrequently and can tolerate the loss of an Availability Zone, such as temporary backup copies or cached thumbnails, and wants to minimize storage costs.
Why candidates choose this
Candidates may choose S3 One Zone-IA because it offers lower storage costs than S3 Standard-IA, overlooking the requirement for high durability and availability needed for compliance and legal data retention.
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 see 'rarely accessed' and 'retrievable within 24 hours' and incorrectly choose S3 Glacier Flexible Retrieval, forgetting that Glacier retrieval times are typically minutes to hours (not milliseconds) and that S3 Standard-IA is the correct infrequent-access tier for data that still needs rapid retrieval.
Detailed technical explanation
How to think about this question
S3 Standard-IA uses erasure coding across multiple Availability Zones to provide 99.999999999% durability and 99.9% availability, with a minimum storage charge of 30 days and a per-GB retrieval fee. The 24-hour retrieval requirement is easily satisfied because S3 Standard-IA offers the same millisecond first-byte latency as S3 Standard, unlike Glacier classes which have retrieval times measured in minutes to hours. In real-world scenarios, companies often misapply Glacier Flexible Retrieval for data that is still accessed quarterly, incurring unnecessary retrieval costs and delays.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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: Amazon S3 Standard-Infrequent Access (S3 Standard-IA) — From day 91 to day 365, the data is rarely accessed but must be retrievable within 24 hours. Amazon S3 Standard-IA (S3 Standard-IA) is designed for infrequently accessed data that needs rapid access when required, with retrieval times in milliseconds, easily meeting the 24-hour requirement. It offers lower storage costs than S3 Standard while still providing high durability and low-latency retrieval, making it the most cost-effective choice for this period.
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.
Are there clue words in this question I should notice?
Yes — watch for: "first", "minimum / minimize". 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
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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