- A
Standard Reserved Instances for a specific instance family and size only.
Why wrong: Standard Reserved Instances are more restrictive. If the team frequently changes instance families and/or sizes, the instance that is actually used may fall outside the reservation scope, reducing how much of the usage receives the discount.
- B
Savings Plans (Compute Savings Plans), scoped for flexible EC2 usage in the region.
Compute Savings Plans provide discounted pricing for steady usage while allowing flexibility across instance families, OS, and sizes within the selected scope (for example, region). That matches the scenario: demand is steady enough for discounts, but the underlying instance type choices change frequently to meet performance needs.
- C
Spot Instances for all workloads, assuming interruptions will never happen.
Why wrong: Spot can significantly reduce costs, but interruptions can happen at any time. The scenario does not state that all workloads can tolerate interruptions, and assuming interruptions “will never happen” is not a reliable design assumption. Also, Spot is not selected here because the team specifically asks for predictable cost discounts with flexibility, not interruption tolerance design.
- D
On-Demand only, because it avoids the complexity of purchase option scopes.
Why wrong: On-Demand provides no commitment-based discount. If the requirement includes predictable cost savings, On-Demand alone does not meet that goal.
SAA-C03 Design Cost-Optimized Architectures Practice Question
This SAA-C03 practice question tests your understanding of design cost-optimized architectures. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 runs EC2 workloads in one region with somewhat steady overall demand. Over time, the team frequently changes instance families (for performance/optimization) and sometimes changes instance size, but wants predictable cost discounts. Which purchase option provides the best balance of cost savings and flexibility?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Savings Plans (Compute Savings Plans), scoped for flexible EC2 usage in the region.
Compute Savings Plans offer the best balance of cost savings and flexibility because they provide up to 66% discount in exchange for a commitment to a consistent amount of compute usage (measured per hour) in a region, but they automatically apply to any EC2 instance family, size, OS, or tenancy, as well as AWS Fargate and Lambda. This matches the team's need to frequently change instance families and sizes while still getting predictable discounts, unlike Standard RIs which lock you to a specific family and size.
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.
- ✗
Standard Reserved Instances for a specific instance family and size only.
Why it's wrong here
Standard Reserved Instances are more restrictive. If the team frequently changes instance families and/or sizes, the instance that is actually used may fall outside the reservation scope, reducing how much of the usage receives the discount.
- ✓
Savings Plans (Compute Savings Plans), scoped for flexible EC2 usage in the region.
Why this is correct
Compute Savings Plans provide discounted pricing for steady usage while allowing flexibility across instance families, OS, and sizes within the selected scope (for example, region). That matches the scenario: demand is steady enough for discounts, but the underlying instance type choices change frequently to meet performance needs.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Spot Instances for all workloads, assuming interruptions will never happen.
Why it's wrong here
Spot can significantly reduce costs, but interruptions can happen at any time. The scenario does not state that all workloads can tolerate interruptions, and assuming interruptions “will never happen” is not a reliable design assumption. Also, Spot is not selected here because the team specifically asks for predictable cost discounts with flexibility, not interruption tolerance design.
- ✗
On-Demand only, because it avoids the complexity of purchase option scopes.
Why it's wrong here
On-Demand provides no commitment-based discount. If the requirement includes predictable cost savings, On-Demand alone does not meet that goal.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Standard Reserved Instances (which lock family/size) with Convertible RIs (which allow family changes but require a 1:1 exchange and still have restrictions), or they assume Savings Plans only apply to EC2, missing that Compute Savings Plans also cover Fargate and Lambda, making them the most flexible option for compute cost optimization.
Trap categories for this question
Scenario analysis trap
Spot can significantly reduce costs, but interruptions can happen at any time. The scenario does not state that all workloads can tolerate interruptions, and assuming interruptions “will never happen” is not a reliable design assumption. Also, Spot is not selected here because the team specifically asks for predictable cost discounts with flexibility, not interruption tolerance design.
Detailed technical explanation
How to think about this question
Compute Savings Plans apply discounts to eligible compute usage up to the committed hourly amount, and any usage beyond that is charged at On-Demand rates. Under the hood, the discount is applied based on the normalized unit of compute (e.g., per vCPU-hour or per GB-hour), so switching from a c5.xlarge to an r6g.large still receives the same discount rate as long as the total normalized compute usage stays within the commitment. A real-world scenario: a team migrates from Intel-based m5 instances to Graviton-based m6g instances for cost efficiency; Compute Savings Plans automatically apply the same discount to the new family without any manual reservation changes.
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.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
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: Savings Plans (Compute Savings Plans), scoped for flexible EC2 usage in the region. — Compute Savings Plans offer the best balance of cost savings and flexibility because they provide up to 66% discount in exchange for a commitment to a consistent amount of compute usage (measured per hour) in a region, but they automatically apply to any EC2 instance family, size, OS, or tenancy, as well as AWS Fargate and Lambda. This matches the team's need to frequently change instance families and sizes while still getting predictable discounts, unlike Standard RIs which lock you to a specific family and size.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
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