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Quick Answer
The answer is to use Spot Instances for fault-tolerant, flexible workloads, combined with Reserved Instances or Savings Plans for predictable, steady-state usage. This trio directly targets the two main levers of AWS cost optimization: exploiting unused capacity for interruptible tasks and committing to long-term usage for discounts up to 72% over On-Demand pricing. On the SAA-C03 exam, this concept tests your ability to match workload characteristics to the right pricing model—a common trap is choosing On-Demand for everything, which ignores the significant savings available through commitment or spot capacity. Remember that Spot Instances are ideal for stateless, batch, or containerized jobs, while Reserved Instances or Savings Plans anchor the baseline. A simple memory tip: “Spot the flexible, Reserve the steady, and you’ll save plenty.”
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 is migrating its on-premises workloads to AWS and wants to optimize costs. Which three strategies should the company implement to achieve a cost-optimized architecture? (Choose three.)
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
✓
Use Reserved Instances or Savings Plans for predictable workloads to reduce costs compared to On-Demand pricing.
Reserved Instances or Savings Plans provide significant discounts (up to 72%) over On-Demand pricing for predictable workloads by committing to a specific usage term (1 or 3 years). This directly reduces compute costs for steady-state applications, making it a core cost-optimization strategy.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'maximizing performance' with 'cost optimization' and select the option to provision extra instances for peak load, failing to recognize that auto scaling and right-sizing are the correct approaches to balance cost and performance.
Detailed technical explanation
How to think about this question
Auto Scaling works by using CloudWatch alarms to trigger scale-out or scale-in events based on metrics like CPU utilization or request count, ensuring capacity matches demand in near real-time. Spot Instances leverage spare EC2 capacity at up to 90% discount, but can be reclaimed with a 2-minute warning, making them ideal for stateless, fault-tolerant workloads like batch processing or CI/CD pipelines. Combining Reserved Instances for baseline capacity with Spot Instances for variable demand is a common cost-optimization pattern.
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.
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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: Use Reserved Instances or Savings Plans for predictable workloads to reduce costs compared to On-Demand pricing. — Reserved Instances or Savings Plans provide significant discounts (up to 72%) over On-Demand pricing for predictable workloads by committing to a specific usage term (1 or 3 years). This directly reduces compute costs for steady-state applications, making it a core cost-optimization strategy.
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
This SAA-C03 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SAA-C03 exam.
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