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Question 289 of 1,546

Cost and Performance Optimization →hardMultiple ChoiceObjective-mapped

SOA-C02 Cost and Performance Optimization Practice Question

This SOA-C02 practice question tests your understanding of cost and performance optimization. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 stores video files in Amazon S3. The files are accessed frequently for the first week, then weekly for the next month, and then rarely after that. The files must be retained for 5 years and any access must be served within minutes. The SysOps administrator needs to minimize storage costs while meeting these requirements. Which lifecycle policy configuration is the most cost-effective?

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.

A
Transition to S3 Standard-IA after 7 days, then to S3 Glacier Flexible Retrieval after 30 days.
Why wrong: Glacier Flexible Retrieval has retrieval times of 1-5 minutes typically (expedited) or 3-5 hours (standard). Though expedited can be minutes, it incurs additional cost, and the standard retrieval may exceed the 'within minutes' requirement. Glacier Instant Retrieval is a better and more cost-effective option.
B
Transition to S3 One Zone-IA after 7 days, then to S3 Glacier Deep Archive after 30 days.
Why wrong: One Zone-IA does not provide the same durability as Standard-IA and is not recommended for critical data. Glacier Deep Archive has retrieval times of 12 hours or more, which fails the 'within minutes' requirement.
C
Transition to S3 Standard-IA after 7 days, then to S3 Glacier Instant Retrieval after 30 days.
Standard-IA provides low-latency access for the weekly access period, and Glacier Instant Retrieval provides the lowest storage cost for long-term, rarely accessed data that still needs millisecond retrieval, meeting the requirements cost-effectively.
D
Transition to S3 Intelligent-Tiering after 7 days.
Why wrong: Intelligent-Tiering automatically moves data between tiers based on access patterns, but it charges a monthly monitoring fee per object that may be cost-prohibitive for many small files. Additionally, it does not transition to the cheapest long-term tier like Glacier Instant Retrieval, so overall costs may be higher.

Full breakdown with real-world context →

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

✓

Transition to S3 Standard-IA after 7 days, then to S3 Glacier Instant Retrieval after 30 days.

Option C is correct because it transitions to S3 Standard-IA after 7 days (matching the frequent first-week access), then to S3 Glacier Instant Retrieval after 30 days (matching the weekly access for the next month). Glacier Instant Retrieval provides millisecond retrieval for rarely accessed data, meeting the 'within minutes' requirement while minimizing costs compared to Standard-IA or Intelligent-Tiering.

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.

✗
Transition to S3 Standard-IA after 7 days, then to S3 Glacier Flexible Retrieval after 30 days.
Why it's wrong here
Glacier Flexible Retrieval has retrieval times of 1-5 minutes typically (expedited) or 3-5 hours (standard). Though expedited can be minutes, it incurs additional cost, and the standard retrieval may exceed the 'within minutes' requirement. Glacier Instant Retrieval is a better and more cost-effective option.
✗
Transition to S3 One Zone-IA after 7 days, then to S3 Glacier Deep Archive after 30 days.
Why it's wrong here
One Zone-IA does not provide the same durability as Standard-IA and is not recommended for critical data. Glacier Deep Archive has retrieval times of 12 hours or more, which fails the 'within minutes' requirement.
✓
Transition to S3 Standard-IA after 7 days, then to S3 Glacier Instant Retrieval after 30 days.
Why this is correct
Standard-IA provides low-latency access for the weekly access period, and Glacier Instant Retrieval provides the lowest storage cost for long-term, rarely accessed data that still needs millisecond retrieval, meeting the requirements cost-effectively.
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.
✗
Transition to S3 Intelligent-Tiering after 7 days.
Why it's wrong here
Intelligent-Tiering automatically moves data between tiers based on access patterns, but it charges a monthly monitoring fee per object that may be cost-prohibitive for many small files. Additionally, it does not transition to the cheapest long-term tier like Glacier Instant Retrieval, so overall costs may be higher.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse S3 Glacier Flexible Retrieval or S3 Glacier Deep Archive as cost-effective options without verifying the retrieval time requirement, assuming 'Glacier' always means cheap but slow, while the question explicitly requires access 'within minutes'.

Detailed technical explanation

How to think about this question

S3 Glacier Instant Retrieval is designed for long-lived, rarely accessed data that still requires millisecond retrieval, making it ideal for the 'weekly then rarely' pattern. The lifecycle policy uses the 'Transition' action with a 'Days' parameter, and the 30-day transition aligns with the S3 lifecycle minimum 30-day rule for transitioning from Standard-IA to Glacier Instant Retrieval. Under the hood, S3 Glacier Instant Retrieval stores data in a separate storage class with a lower per-GB storage cost but a higher retrieval cost, so the policy must balance access frequency with cost.

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 SOA-C02 question test?

Cost and Performance Optimization — This question tests Cost and Performance Optimization — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Transition to S3 Standard-IA after 7 days, then to S3 Glacier Instant Retrieval after 30 days. — Option C is correct because it transitions to S3 Standard-IA after 7 days (matching the frequent first-week access), then to S3 Glacier Instant Retrieval after 30 days (matching the weekly access for the next month). Glacier Instant Retrieval provides millisecond retrieval for rarely accessed data, meeting the 'within minutes' requirement while minimizing costs compared to Standard-IA or Intelligent-Tiering.

What should I do if I get this SOA-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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