Which S3 Storage Class Meets Rare Access with Immediate Retrieval?

CLF-C02 By islever Editorial Last updated

Identify AWS storage services. Compare AWS pricing models.

Short answer

B S3 Standard-IA stores rarely accessed data at lower cost while still providing immediate retrieval, unlike Glacier tiers.

Question

A company needs to use Amazon S3 to store audio files that are each 5 megabytes in size. The company will rarely access the files, but the company must be able to retrieve the files immediately. Which S3 storage class will meet these requirements MOST cost-effectively?
  1. S3 Standard
  2. S3 Standard-Infrequent Access (S3 Standard-IA) Correct Answer
  3. S3 Glacier Flexible Retrieval
  4. S3 Glacier Deep Archive

Key Takeaways

The question tests choosing an S3 storage class by access frequency and retrieval latency; the trap is selecting a cheaper Glacier tier that cannot retrieve objects immediately.

S3 Standard-Infrequent Access (S3 Standard-IA) is the most cost-effective S3 storage class for data that is rarely accessed but must be retrievable immediately, unlike Glacier classes that add retrieval latency. This CLF-C02 question tests matching storage classes to access frequency and retrieval-time requirements.

Common mistake: Choosing S3 Glacier Flexible Retrieval (C) because its per-GB storage price is lower, while ignoring that archive classes do not support immediate retrieval.

Expert Analysis

Why the Answer Is Correct

S3 Standard-IA is engineered for exactly the pattern in the scenario: data that is accessed infrequently but must remain available with millisecond latency. Its per-GB storage price is lower than S3 Standard, and the class charges a retrieval fee only when objects are read, keeping total cost low for rarely accessed audio files. Because each file is 5 MB, it far exceeds the 128 KB minimum billable object size for Standard-IA, so there is no small-object billing penalty. No other class in the list combines immediate retrieval with a lower storage cost than S3 Standard for this access pattern.

Why the Other Options Are Wrong

S3 Standard (A) provides immediate retrieval but carries a higher per-GB storage price than Standard-IA, so it is not the most cost-effective choice for files that are rarely accessed. S3 Glacier Flexible Retrieval (C) and S3 Glacier Deep Archive (D) are archive storage classes; both are cheaper to store data in, but neither can retrieve objects immediately—Flexible Retrieval takes minutes to hours, and Deep Archive takes hours. A learner comment cited lower Glacier storage prices, but cost per GB alone is irrelevant when the retrieval-latency requirement eliminates those classes. The question's phrase "must be able to retrieve the files immediately" directly disqualifies both Glacier options.

Community Comment Notes

ShaiTay captured the deciding logic, noting that S3 Standard-IA is "rarely accessed, but needs to be retrieved immediately." BlueMan93 also ruled out Glacier because it is "designed for archiving data that doesn't require immediate access." CharmaineBowman compared monthly storage costs and leaned toward Glacier Flexible Retrieval, but that comparison omitted the retrieval-latency requirement the question explicitly imposes. a77c459 kept it simple with "B looks right answer," reflecting the clear consensus.

Official Reference

These links open the official vendor documentation in a new tab.

Exam Strategy

On CLF-C02, when a scenario says 'rarely accessed' but also 'immediate retrieval,' immediately eliminate all Glacier classes and choose the infrequent-access class. Memorize the retrieval times: Standard and Standard-IA are milliseconds, Glacier Flexible Retrieval is minutes to hours, and Deep Archive is hours.

Frequently Asked Questions

Why isn't S3 Glacier Flexible Retrieval the most cost-effective choice here?

Glacier Flexible Retrieval has lower storage cost but cannot retrieve files immediately; the question requires immediate access, so Standard-IA wins on cost-effectiveness for this use case.

Does S3 Standard-IA have a minimum billable object size?

Yes, objects smaller than 128 KB are billed as 128 KB in Standard-IA, but these 5 MB audio files exceed that threshold, so no penalty applies.

More CLF-C02 FAQ →

Community Votes

B
75%
C
25%

75% of anonymous learners picked answer B. Votes are pick records left by other test-takers — they are not the verified answer.

Discussion 4 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.

From public community threads 4

  1. BlueMan93 👍 1 Answered B
    Answer is B: Amazon S3 Glacier Flexible Retrieval is a storage class within Amazon S3 designed for archiving data that doesn't require immediate access (this rules out Glacier).
  2. ShaiTay 👍 1 Answered B
    B. S3 Standard-Infrequent Access (S3 Standard-IA) - Best suited for data that is rarely accessed, but needs to be retrieved immediately when needed.
  3. CharmaineBowman 👍 1 Answered C
    S3 Standard IA - Storage Cost: $0.0125 × 100 = $1.25/month S3 Glacier Flexible Retrieval: Storage Cost: $0.004 × 100 = $0.40/month
  4. a77c459 👍 1 Answered B
    B looks right answer.

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