- A
Purchase a Compute Savings Plan to receive discounted rates for a usage amount over a 1-year term.
Compute Savings Plans provide discounted EC2 usage (and related compute usage) versus On-Demand for a committed amount per hour. They are not limited to a single instance type, so the team can change instance families while staying within the committed usage.
- B
Purchase a Reserved Instance that must be tied to exactly one specific instance size (no flexibility to switch instance families).
Why wrong: Reserved Instances typically require commitment to attributes like instance family/operating system/tenancy, which limits flexibility. The statement that they must be tied to exactly one instance size with no flexibility is not the key distinction; more importantly, Savings Plans are generally more flexible across instance types than many Reserved Instance choices.
- C
Only use Spot Instances and set the workload to stop immediately if capacity is interrupted.
Why wrong: Spot can reduce cost, but it is not aligned with a steady 24/7 usage expectation if the workload cannot tolerate interruptions or forced stops.
- D
Rely on On-Demand pricing and add more alarms to detect when costs spike.
Why wrong: Monitoring and alarms help detect cost changes, but they do not reduce the underlying On-Demand pricing charges.
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 expects steady compute usage around the clock for the next year. They want to reduce costs compared to On-Demand pricing, without tightly planning specific instance types. Which option best matches their goal?
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
Purchase a Compute Savings Plan to receive discounted rates for a usage amount over a 1-year term.
A Compute Savings Plan offers the lowest prices on EC2 compute usage (including Fargate and Lambda) in exchange for a commitment to a consistent amount of compute (measured in $/hour) over a 1-year or 3-year term. This matches the startup's steady, predictable usage and provides up to 66% savings over On-Demand, while allowing flexibility to change instance families, sizes, regions, or even switch to containers without renegotiating the plan.
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.
- ✓
Purchase a Compute Savings Plan to receive discounted rates for a usage amount over a 1-year term.
Why this is correct
Compute Savings Plans provide discounted EC2 usage (and related compute usage) versus On-Demand for a committed amount per hour. They are not limited to a single instance type, so the team can change instance families while staying within the committed usage.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Purchase a Reserved Instance that must be tied to exactly one specific instance size (no flexibility to switch instance families).
Why it's wrong here
Reserved Instances typically require commitment to attributes like instance family/operating system/tenancy, which limits flexibility. The statement that they must be tied to exactly one instance size with no flexibility is not the key distinction; more importantly, Savings Plans are generally more flexible across instance types than many Reserved Instance choices.
- ✗
Only use Spot Instances and set the workload to stop immediately if capacity is interrupted.
Why it's wrong here
Spot can reduce cost, but it is not aligned with a steady 24/7 usage expectation if the workload cannot tolerate interruptions or forced stops.
- ✗
Rely on On-Demand pricing and add more alarms to detect when costs spike.
Why it's wrong here
Monitoring and alarms help detect cost changes, but they do not reduce the underlying On-Demand pricing charges.
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 both lock you to a specific instance type, but Compute Savings Plans provide full flexibility across instance families, sizes, and even compute services.
Detailed technical explanation
How to think about this question
A Compute Savings Plan applies a discounted hourly rate to any eligible compute usage up to the committed amount, automatically covering EC2 instances, Fargate, and Lambda across any region. Under the hood, AWS calculates the effective discount by comparing the committed $/hour against the On-Demand rates of the actual resources used, and any usage beyond the commitment is billed at standard On-Demand rates. In a real-world scenario, a startup that expects steady usage but may later migrate from EC2 to ECS Fargate can keep the same Savings Plan, avoiding the need to modify or exchange reservations.
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
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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: Purchase a Compute Savings Plan to receive discounted rates for a usage amount over a 1-year term. — A Compute Savings Plan offers the lowest prices on EC2 compute usage (including Fargate and Lambda) in exchange for a commitment to a consistent amount of compute (measured in $/hour) over a 1-year or 3-year term. This matches the startup's steady, predictable usage and provides up to 66% savings over On-Demand, while allowing flexibility to change instance families, sizes, regions, or even switch to containers without renegotiating the plan.
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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