- A
On-Demand Instances only, because they automatically adjust to future needs
Why wrong: On-Demand Instances provide flexibility, but they do not offer discounted pricing through a commitment. For a predictable 24/7 workload, a commitment-based option (Savings Plans or Reserved Instances) is typically required to achieve the lowest cost.
- B
Compute Savings Plans, committed for a 1- to 3-year term in the Region
Compute Savings Plans provide discounted pricing in exchange for committing to a consistent hourly spend (scoped to a Region). They apply to EC2 usage and are flexible enough that you can change EC2 instance families over time while still receiving the Savings Plans discount within the commitment scope.
- C
Standard Reserved Instances tied to a single instance type and Availability Zone
Why wrong: Standard Reserved Instances can be discounted, but they are much less flexible for changing instance families. If you switch to different instance types/families over time, you may not be covered by the original RI (or you would need exchanges that may reduce the economic benefit).
- D
EC2 Spot Instances, because they are always cheaper than savings programs
Why wrong: Spot Instances can be cheaper, but their price is variable and capacity can be reclaimed, causing interruptions. For a workload required to run continuously (24/7), Spot is generally not the best fit unless the architecture can tolerate termination and the business requirements allow interruption.
Quick Answer
The answer is Compute Savings Plans with a 1- or 3-year commitment in the Region. This is correct because Compute Savings Plans provide the lowest cost for steady, predictable 24/7 workloads while offering the crucial instance family flexibility that Reserved Instances lack—you can switch between EC2 instance families, or even to Fargate and Lambda, within the same Region without losing your discount. On the SAA-C03 exam, this scenario tests your understanding that Reserved Instances lock you into a specific instance family, whereas Compute Savings Plans decouple the discount from the hardware, making them ideal when future flexibility is required. A common trap is choosing Standard Reserved Instances for the lowest absolute price, forgetting that any family change would force you to pay On-Demand rates. Memory tip: “Compute Plans = Family Flex; RIs = Family Fixed.”
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 has a steady, predictable workload that must run continuously (24/7) in a single AWS Region. The team wants the lowest cost option available for this steady usage, but also expects they may choose different EC2 instance families in the future (without re-buying compute discounts). Which AWS purchase option best meets these goals?
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
Compute Savings Plans, committed for a 1- to 3-year term in the Region
Compute Savings Plans offer the lowest cost for steady, predictable workloads while providing instance family flexibility within a Region. Unlike Reserved Instances, they automatically apply discounts to any EC2 instance family (and even Fargate/Lambda) in the chosen Region, so the company can switch instance families in the future without losing the discount. A 1- or 3-year commitment yields significant savings (up to 66%) compared to On-Demand, making it the optimal choice for this scenario.
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.
- ✗
On-Demand Instances only, because they automatically adjust to future needs
Why it's wrong here
On-Demand Instances provide flexibility, but they do not offer discounted pricing through a commitment. For a predictable 24/7 workload, a commitment-based option (Savings Plans or Reserved Instances) is typically required to achieve the lowest cost.
- ✓
Compute Savings Plans, committed for a 1- to 3-year term in the Region
Why this is correct
Compute Savings Plans provide discounted pricing in exchange for committing to a consistent hourly spend (scoped to a Region). They apply to EC2 usage and are flexible enough that you can change EC2 instance families over time while still receiving the Savings Plans discount within the commitment scope.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Standard Reserved Instances tied to a single instance type and Availability Zone
Why it's wrong here
Standard Reserved Instances can be discounted, but they are much less flexible for changing instance families. If you switch to different instance types/families over time, you may not be covered by the original RI (or you would need exchanges that may reduce the economic benefit).
- ✗
EC2 Spot Instances, because they are always cheaper than savings programs
Why it's wrong here
Spot Instances can be cheaper, but their price is variable and capacity can be reclaimed, causing interruptions. For a workload required to run continuously (24/7), Spot is generally not the best fit unless the architecture can tolerate termination and the business requirements allow interruption.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Reserved Instances (which lock instance family and AZ) with Savings Plans (which offer regional flexibility), leading them to choose Standard Reserved Instances despite the stated requirement for future instance family changes.
Detailed technical explanation
How to think about this question
Compute Savings Plans apply a consistent hourly discount to compute usage across EC2, Fargate, and Lambda, measured in dollars per hour of compute. The discount is applied to the first $X of compute usage in the Region, regardless of instance family, size, or OS, as long as the commitment is met. This flexibility is achieved through a 'flexible consumption' model where the savings plan rate is compared to the On-Demand rate of the specific resource used, enabling seamless migration between instance families (e.g., from m5 to c6i) without renegotiating the plan.
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: Compute Savings Plans, committed for a 1- to 3-year term in the Region — Compute Savings Plans offer the lowest cost for steady, predictable workloads while providing instance family flexibility within a Region. Unlike Reserved Instances, they automatically apply discounts to any EC2 instance family (and even Fargate/Lambda) in the chosen Region, so the company can switch instance families in the future without losing the discount. A 1- or 3-year commitment yields significant savings (up to 66%) compared to On-Demand, making it the optimal choice for this scenario.
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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