The answer is a Compute Savings Plan. This is the correct choice because it delivers a significant discount—up to 66%—in exchange for a commitment to a consistent amount of compute usage measured in dollars per hour over a 1- or 3-year term, while retaining full flexibility across instance families, sizes, operating systems, tenancy, and regions. For the SAA-C03 exam, this scenario tests your understanding of how to balance cost optimization with operational simplicity, as the requirement to avoid custom scripts eliminates manual instance migration or automation. A common trap is choosing Reserved Instances, which lock you into a specific instance family and lack the flexibility needed here. Memory tip: think of Compute Savings Plans as “flexible commitment”—you commit to spending a certain amount per hour, not to a specific instance type, making it ideal for predictable workloads that may need to shift families over time.
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. A key principle to apply: compute Savings Plans apply to EC2, Fargate, and Lambda usage.. 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? The design must avoid adding custom operational scripts.
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) 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 still allowing flexibility across instance families, sizes, OS, tenancy, and regions. This matches the predictable three-year workload and the requirement for instance-family flexibility without custom scripts.
Key principle: Compute Savings Plans apply to EC2, Fargate, and Lambda usage.
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
Compute Savings Plans apply to EC2, Fargate, and Lambda usage.
✗
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 confuse Savings Plans with Reserved Instances, assuming that any commitment requires locking into a specific instance family, but Compute Savings Plans explicitly provide family flexibility while still delivering a significant discount.
Detailed technical explanation
How to think about this question
Compute Savings Plans apply to EC2, Fargate, and Lambda usage, automatically applying the lowest price across any instance family within a region. Unlike Reserved Instances, which lock you to a specific instance family (e.g., m5.large), a Compute Savings Plan lets you switch between, say, c5.large and r5.large without renegotiating the plan. The discount is applied to your hourly compute usage up to the committed amount, and any usage beyond that is charged at standard On-Demand rates.
KKey Concepts to Remember
Compute Savings Plans apply to EC2, Fargate, and Lambda usage.
They offer discounts for a commitment to a consistent amount of compute usage (USD/hour).
Compute Savings Plans provide flexibility across instance family, size, OS, and Region.
Commitment terms are typically one or three years.
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
Compute Savings Plans apply to EC2, Fargate, and Lambda usage.
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.
Review compute Savings Plans apply to EC2, Fargate, and Lambda usage., then practise related SAA-C03 questions on the same topic to reinforce the concept.
Design Cost-Optimized Architectures — This question tests Design Cost-Optimized Architectures — Compute Savings Plans apply to EC2, Fargate, and Lambda usage..
What is the correct answer to this question?
The correct answer is: Compute Savings Plan — The Compute Savings Plan (C) 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 still allowing flexibility across instance families, sizes, OS, tenancy, and regions. This matches the predictable three-year workload and the requirement for instance-family flexibility without custom scripts.
What should I do if I get this SAA-C03 question wrong?
Review compute Savings Plans apply to EC2, Fargate, and Lambda usage., then practise related SAA-C03 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Compute Savings Plans apply to EC2, Fargate, and Lambda usage.
About these practice questions
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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 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? The architecture review board prefers a managed AWS-native control.
medium
A.S3 Intelligent-Tiering
B.Dedicated Instances
✓ C.Compute Savings Plan
D.Spot Instances only
Why C: A Compute Savings Plan offers the lowest prices on EC2 compute usage (up to 66% off On-Demand) in exchange for a 1- or 3-year commitment, while allowing instance-family flexibility across any region, OS, or tenancy. This matches the predictable three-year workload and the team's requirement for instance-family flexibility, and it is a managed AWS-native offering (no manual reservation management).
Variation 2. 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?
easy
✓ A.Purchase a Compute Savings Plan to receive discounted rates for a usage amount over a 1-year term.
B.Purchase a Reserved Instance that must be tied to exactly one specific instance size (no flexibility to switch instance families).
C.Only use Spot Instances and set the workload to stop immediately if capacity is interrupted.
D.Rely on On-Demand pricing and add more alarms to detect when costs spike.
Why A: 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.
Variation 3. A media company runs a fleet of EC2 instances using Auto Scaling across multiple instance families (for example, m-series and c-series) in a single region. The business wants to commit to steady usage for one year to reduce cost, but the application team must retain flexibility to switch instance families and scale up/down as demand changes. They need the cost-reduction approach that best matches this flexibility. Which option is the best fit?
medium
A.Purchase Standard Reserved Instances tied to a specific instance family and region, so the application can only run on the selected family.
✓ B.Purchase Compute Savings Plans so the commitment applies regardless of instance family changes within the selected scope.
C.Purchase Spot Instances for all capacity and disable On-Demand fallback to guarantee the lowest cost.
D.Rely only on On-Demand and reduce cost by using a CloudFront-only approach for all dynamic content.
Why B: Compute Savings Plans provide the most flexibility because they apply to any EC2 instance family (including m-series and c-series) within a region, automatically adjusting to instance family changes and scaling. This matches the requirement to commit to steady usage for one year while retaining the ability to switch families and scale up/down, offering up to 66% savings over On-Demand without locking the application to a specific instance type.
Variation 4. A SaaS company runs a production API on an EC2 Auto Scaling group with steady demand 24/7. The team uses multiple instance types over time (they switch types during tuning) but the overall compute hours are stable. They want a cost reduction without committing to a specific instance type or size. Which AWS pricing option best meets the requirement?
medium
A.Buy EC2 Spot Instances for the Auto Scaling group to maximize savings
✓ B.Purchase a Compute Savings Plan for the region and commit to a dollar-per-hour amount
C.Purchase Reserved Instances that are limited to a single specific instance type in the Auto Scaling group
D.Use on-demand only, and rely on Auto Scaling to reduce cost during low utilization
Why B: B is correct because a Compute Savings Plan provides the flexibility to change instance types, sizes, and even compute services (e.g., EC2, Fargate, Lambda) within a region while still receiving discounted rates (up to 66% vs. on-demand). This matches the requirement of reducing costs without committing to a specific instance type or size, as the plan is based on a dollar-per-hour commitment rather than instance family or tenancy.
Last reviewed: Jun 11, 2026
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