The answer is a Compute Savings Plan. This is the correct choice because it provides the deepest discounts—up to 66% off On-Demand rates—while allowing you to freely change instance family, size, OS, and even AWS region, which directly matches the startup’s need for a flexible instance type over a consistent one-year term. On the SAA-C03 exam, this question tests your ability to distinguish between Savings Plans and Reserved Instances; a common trap is choosing Standard Reserved Instances, which lock you into a specific instance family and size, sacrificing the flexibility this scenario demands. Remember the key memory tip: “Compute Savings Plan = flexibility across families and regions; Reserved Instance = locked to one family.”
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 startup has a stable production web service that runs continuously (24/7) on AWS. They have consistent compute requirements for the next 1 year, but the instance size and family might change as they optimize performance. To reduce cost while maintaining flexibility across instance types, which purchasing option should they consider?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Compute Savings Plans
Compute Savings Plans offer the lowest prices (up to 66% off On-Demand) while allowing flexibility to change instance family, size, OS, and region. This matches the startup's need for consistent 1-year compute usage with potential instance type changes during optimization.
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.
✓
Compute Savings Plans
Why this is correct
Compute Savings Plans discount compute usage while allowing flexibility across instance families, sizes, and even some services.
Related concept
Read the scenario before looking for a memorised answer.
✗
Reserved Instances with a fixed instance type
Why it's wrong here
Fixed instance-type Reserved Instances can limit flexibility if the team needs to change instance families.
✗
Spot Instances
Why it's wrong here
Spot is interruption-capable and may not be appropriate for always-on production without added complexity.
✗
On-Demand Instances
Why it's wrong here
On-Demand provides maximum flexibility but generally lacks the savings of commitment-based plans.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose Reserved Instances for steady-state workloads, overlooking that Compute Savings Plans offer the same discount level with greater flexibility for instance family changes, which is explicitly required in the scenario.
Detailed technical explanation
How to think about this question
Compute Savings Plans apply to any EC2 instance, including Fargate and Lambda, automatically at the account level. They provide a hourly commitment (e.g., $10/hour) and discount applies regardless of instance family, size, or region, unlike Reserved Instances which are region- and AZ-specific. This makes them ideal for startups that anticipate instance type changes but want to lock in savings for a 1-year or 3-year term.
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 Plans — Compute Savings Plans offer the lowest prices (up to 66% off On-Demand) while allowing flexibility to change instance family, size, OS, and region. This matches the startup's need for consistent 1-year compute usage with potential instance type changes during optimization.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A production internal reporting portal 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?
medium
A.Spot Instances only
B.Dedicated Instances
✓ C.Compute Savings Plan
D.S3 Intelligent-Tiering
Why C: A Compute Savings Plan offers the lowest prices on EC2 usage (up to 66% off On-Demand) in exchange for a 1- or 3-year commitment, and it automatically applies to any EC2 instance family in any region, giving the flexibility the team needs. Since the workload runs continuously with predictable usage for three years, this plan is ideal for reducing costs while retaining the ability to change instance families if needed.
Variation 2. A production internal reporting portal 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? The architecture review board prefers a managed AWS-native control.
medium
A.Spot Instances only
B.Dedicated Instances
✓ C.Compute Savings Plan
D.S3 Intelligent-Tiering
Why C: The Compute Savings Plan offers the largest 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 retaining flexibility across instance families, regions, and compute services (EC2, Fargate, Lambda). This matches the requirement for a discount on predictable three-year usage with instance-family flexibility, and it is a managed AWS-native purchasing option.
Variation 3. A startup has a stable production web service that runs continuously (24/7) on AWS. They have consistent compute requirements for the next 1 year, but the instance size and family might change as they optimize performance. To reduce cost while maintaining flexibility across instance types, which purchasing option should they consider?
easy
✓ A.Compute Savings Plans
B.Reserved Instances with a fixed instance type
C.Spot Instances
D.On-Demand Instances
Why A: Compute Savings Plans offer the lowest prices for EC2 compute usage (up to 66% off On-Demand) while allowing flexibility to change instance family, size, OS, and region (within a region). This matches the startup's need for consistent 1-year compute requirements with potential instance type changes during performance optimization.
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This SAA-C03 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 SAA-C03 exam.
Question Discussion
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