SAA-C03 Design Cost-Optimized Architectures Practice Question
This SAA-C03 practice question tests your understanding of design cost-optimized architectures. 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 production log archive runs continuously on EC2 with predictable usage for the next three years. The team wants a discount while retaining some instance-family flexibility. What should they buy?
Why wrong: Dedicated Instances isolate hardware but do not primarily optimize cost.
C
Compute Savings Plan
Compute Savings Plans provide discounts for a committed spend while allowing flexibility across instance families, sizes, Regions, and compute services.
D
Spot Instances only
Why wrong: Spot is interruptible and not ideal for always-on production baselines.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Compute Savings Plan
The Compute Savings Plan (C) is correct because it offers a discount (up to 66%) in exchange for a commitment to a consistent amount of compute usage (measured in $/hour) for a 1- or 3-year term, while allowing flexibility to change instance families, sizes, OS, tenancy, and even regions within EC2, Fargate, and Lambda. This matches the requirement of predictable usage for three years with instance-family flexibility, unlike Reserved Instances which lock to a specific instance family.
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 Intelligent-Tiering
Why it's wrong here
S3 Intelligent-Tiering optimizes object storage, not EC2 compute spend.
✗
Dedicated Instances
Why it's wrong here
Dedicated Instances isolate hardware but do not primarily optimize cost.
✓
Compute Savings Plan
Why this is correct
Compute Savings Plans provide discounts for a committed spend while allowing flexibility across instance families, sizes, Regions, and compute services.
Related concept
Read the scenario before looking for a memorised answer.
✗
Spot Instances only
Why it's wrong here
Spot is interruptible and not ideal for always-on production baselines.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Compute Savings Plans with Reserved Instances, assuming that any long-term discount requires locking into a specific instance family, but Compute Savings Plans provide both the discount and the flexibility to change instance families, which is the key differentiator tested in this question.
Detailed technical explanation
How to think about this question
Compute Savings Plans apply to a wide range of compute services (EC2, Fargate, Lambda) and automatically apply the lowest price across instance families and regions within the commitment, unlike EC2 Instance Savings Plans which are family-specific. The discount is applied to the on-demand rate up to the committed amount, and any usage beyond the commitment is charged at standard on-demand rates. In a real-world scenario, if the team later needs to migrate from a C5 to an M6i instance family, the Compute Savings Plan continues to provide the same discount without requiring a new purchase.
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.
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.
Design Cost-Optimized Architectures — This question tests Design Cost-Optimized Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Compute Savings Plan — The Compute Savings Plan (C) is correct because it offers a discount (up to 66%) in exchange for a commitment to a consistent amount of compute usage (measured in $/hour) for a 1- or 3-year term, while allowing flexibility to change instance families, sizes, OS, tenancy, and even regions within EC2, Fargate, and Lambda. This matches the requirement of predictable usage for three years with instance-family flexibility, unlike Reserved Instances which lock to a specific instance family.
What should I do if I get this SAA-C03 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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Question Discussion
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