- A
Buy Compute Savings Plans for the expected steady usage.
Compute Savings Plans reduce the hourly cost of predictable usage while preserving flexibility across supported compute services. They are a strong fit when the workload is steady and the team wants savings without interruption risk.
- B
Purchase Standard Reserved Instances for the EC2 fleet.
Standard Reserved Instances are designed for steady EC2 usage in a specific Region and can significantly lower the effective hourly rate versus On-Demand. They align well with a one-year predictable workload that must remain continuously available.
- C
Move the fleet to Spot Instances.
Why wrong: Spot Instances can be much cheaper, but they may be interrupted when spare capacity is reclaimed. That directly conflicts with the requirement to avoid capacity interruptions for a continuously running application.
- D
Use Dedicated Hosts to reserve physical servers for the application.
Why wrong: Dedicated Hosts are typically chosen for licensing or isolation requirements, not for the lowest general-purpose compute price. They usually cost more than commitment-based pricing options for a normal steady-state workload.
- E
Stay entirely on On-Demand Instances because they are already the cheapest option.
Why wrong: On-Demand provides the highest flexibility, but it is not the lowest-cost model for predictable 24/7 usage. The scenario explicitly calls for reducing cost, which requires a commitment-based discount.
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 line-of-business application runs on EC2 instances 24/7 with predictable usage for the next year. The application will stay in the same Region, and the team does not want to manage capacity interruptions. Which two purchase options can reduce cost compared with pure On-Demand pricing? Select two.
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
Buy Compute Savings Plans for the expected steady usage.
Compute Savings Plans (A) offer a flexible discount (up to 66%) in exchange for a 1- or 3-year commitment to a consistent amount of compute usage (measured in $/hour), automatically applying to any EC2 instance family, region, or even AWS Fargate/Lambda. This reduces cost compared to On-Demand while avoiding capacity interruptions, as the commitment covers the predictable steady-state usage. Standard Reserved Instances (B) provide a similar discount (up to 72%) for a specific instance family in a specific region, also with a 1- or 3-year term, and guarantee capacity for the specified AZ if you choose a zonal reservation, ensuring no interruptions.
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.
- ✓
Buy Compute Savings Plans for the expected steady usage.
Why this is correct
Compute Savings Plans reduce the hourly cost of predictable usage while preserving flexibility across supported compute services. They are a strong fit when the workload is steady and the team wants savings without interruption risk.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Purchase Standard Reserved Instances for the EC2 fleet.
Why this is correct
Standard Reserved Instances are designed for steady EC2 usage in a specific Region and can significantly lower the effective hourly rate versus On-Demand. They align well with a one-year predictable workload that must remain continuously available.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Move the fleet to Spot Instances.
Why it's wrong here
Spot Instances can be much cheaper, but they may be interrupted when spare capacity is reclaimed. That directly conflicts with the requirement to avoid capacity interruptions for a continuously running application.
When this WOULD be correct
A question where the application is fault-tolerant, stateless, or can handle interruptions gracefully (e.g., batch processing, big data, or containerized workloads) and cost reduction is the primary goal without strict uptime requirements.
- ✗
Use Dedicated Hosts to reserve physical servers for the application.
Why it's wrong here
Dedicated Hosts are typically chosen for licensing or isolation requirements, not for the lowest general-purpose compute price. They usually cost more than commitment-based pricing options for a normal steady-state workload.
When this WOULD be correct
A question requiring a license that is tied to a specific physical server (e.g., Windows Server with per-socket licensing, or Oracle Database with per-core licensing) and where you must ensure compliance by not sharing the server with other customers. In that scenario, Dedicated Hosts would be the correct choice despite higher cost.
- ✗
Stay entirely on On-Demand Instances because they are already the cheapest option.
Why it's wrong here
On-Demand provides the highest flexibility, but it is not the lowest-cost model for predictable 24/7 usage. The scenario explicitly calls for reducing cost, which requires a commitment-based discount.
When this WOULD be correct
If the question asked 'Which option provides the most flexibility with no upfront commitment and no capacity interruptions?' then staying on On-Demand would be correct because it offers maximum flexibility and no interruption risk.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SAA-C03 exam frequently reuses these exact scenarios with slightly different constraints.
✓Buy Compute Savings Plans for the expected steady usage.Correct answer▾
Why this is correct
Compute Savings Plans reduce the hourly cost of predictable usage while preserving flexibility across supported compute services. They are a strong fit when the workload is steady and the team wants savings without interruption risk.
✗Move the fleet to Spot Instances.Wrong answer — click to see why▾
Why this is wrong here
Spot Instances can be interrupted with a 2-minute notice, which violates the requirement to 'not manage capacity interruptions' for a 24/7 predictable workload.
★ When this WOULD be the correct answer
A question where the application is fault-tolerant, stateless, or can handle interruptions gracefully (e.g., batch processing, big data, or containerized workloads) and cost reduction is the primary goal without strict uptime requirements.
Why candidates choose this
Candidates know Spot Instances offer significant cost savings (up to 90% off On-Demand) and may overlook the interruption risk, especially if they focus only on cost reduction without reading the 'no capacity interruptions' constraint.
✗Use Dedicated Hosts to reserve physical servers for the application.Wrong answer — click to see why▾
Why this is wrong here
Dedicated Hosts provide physical servers dedicated for your use, but they are significantly more expensive than On-Demand instances and do not offer cost savings over Reserved Instances or Savings Plans for predictable workloads.
★ When this WOULD be the correct answer
A question requiring a license that is tied to a specific physical server (e.g., Windows Server with per-socket licensing, or Oracle Database with per-core licensing) and where you must ensure compliance by not sharing the server with other customers. In that scenario, Dedicated Hosts would be the correct choice despite higher cost.
Why candidates choose this
Candidates may think that reserving physical servers (Dedicated Hosts) is similar to Reserved Instances and would reduce costs, but Dedicated Hosts are actually a premium offering for licensing compliance, not a cost-saving measure.
✗Stay entirely on On-Demand Instances because they are already the cheapest option.Wrong answer — click to see why▾
Why this is wrong here
On-Demand Instances are the most expensive option; the question explicitly asks for purchase options that reduce cost compared to pure On-Demand pricing, so staying entirely on On-Demand does not reduce cost.
★ When this WOULD be the correct answer
If the question asked 'Which option provides the most flexibility with no upfront commitment and no capacity interruptions?' then staying on On-Demand would be correct because it offers maximum flexibility and no interruption risk.
Why candidates choose this
Candidates may think On-Demand is already cost-effective or that other options introduce complexity, but they overlook that Reserved Instances or Savings Plans offer significant discounts for steady-state workloads.
Analysis generated from the official SAA-C03blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think Spot Instances are always cheaper and safe for steady workloads, but they forget the interruption risk, or they may confuse Dedicated Hosts with Reserved Instances as a cost-saving measure, when Dedicated Hosts actually increase cost for physical isolation.
Trap categories for this question
Scenario analysis trap
On-Demand provides the highest flexibility, but it is not the lowest-cost model for predictable 24/7 usage. The scenario explicitly calls for reducing cost, which requires a commitment-based discount.
Detailed technical explanation
How to think about this question
Compute Savings Plans apply to any EC2 instance within a region, automatically covering new instance types or sizes as long as the hourly spend stays within the commitment, making them ideal for dynamic or multi-family workloads. Standard Reserved Instances require you to specify the instance family (e.g., m5.large) and offer a capacity reservation if you select a specific Availability Zone, which guarantees no interruption from reclamation. Both options require a 1- or 3-year term, and the discount is applied at the billing level, not at the instance level, so partial usage of the commitment is still charged.
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.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
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: Buy Compute Savings Plans for the expected steady usage. — Compute Savings Plans (A) offer a flexible discount (up to 66%) in exchange for a 1- or 3-year commitment to a consistent amount of compute usage (measured in $/hour), automatically applying to any EC2 instance family, region, or even AWS Fargate/Lambda. This reduces cost compared to On-Demand while avoiding capacity interruptions, as the commitment covers the predictable steady-state usage. Standard Reserved Instances (B) provide a similar discount (up to 72%) for a specific instance family in a specific region, also with a 1- or 3-year term, and guarantee capacity for the specified AZ if you choose a zonal reservation, ensuring no interruptions.
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.
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Last reviewed: Jun 11, 2026
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