SAA-C03 Design Cost-Optimized Architectures Practice Question
A company runs a batch processing job on Amazon EC2 instances that takes approximately 4 hours to complete. The job can be interrupted and resumed from a checkpoint. The company wants to minimize the cost of running this job. Which pricing model should they use?
⚠ Common exam trap
The trap here is assuming that any batch job should use Reserved Instances for savings, overlooking that the job is interruptible and short-term, making Spot Instances the better fit.
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
✓
Spot Instances
Spot Instances are the most cost-effective choice for interruptible batch jobs that can checkpoint and resume. They leverage spare EC2 capacity at steep discounts, and the job's design tolerates interruptions. Reserved and On-Demand pricing do not offer the same savings for this use case, and Dedicated Hosts are overkill. Thus, Spot Instances align with both the workload characteristics and the cost objective.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Dedicated Hosts
Why it's wrong here
Dedicated Hosts provide physical servers dedicated to a single customer, which is useful for licensing and compliance but comes at a premium. This batch job does not require host-level isolation or specialized licensing, so Dedicated Hosts would be unnecessarily expensive. They are not cost-optimized for interruptible, short-duration workloads.
- ✓
Spot Instances
Why this is correct
Spot Instances offer the largest discounts (up to 90% off On-Demand) and are ideal for fault-tolerant, flexible workloads like batch processing that can be interrupted and resumed. Since the job checkpoints its progress, it can handle interruptions gracefully. Using Spot Instances directly addresses the cost minimization goal while accommodating the job's interruptible nature.
- ✗
Reserved Instances
Why it's wrong here
Reserved Instances offer a discount in exchange for a 1- or 3-year commitment. This job is a short-term batch that likely runs infrequently or only once, so a long-term commitment is not justified. Reserved Instances are better suited for steady-state workloads, not for a one-time or sporadic batch job that can tolerate interruptions.
- ✗
On-Demand Instances
Why it's wrong here
On-Demand Instances provide full control and no long-term commitment, but they are priced higher than Spot Instances. Since the job is interruptible and can resume from checkpoints, On-Demand is not the most cost-effective choice. The company would pay the full On-Demand rate for the entire 4 hours, missing the opportunity for significant savings with Spot.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Amazon Web Services exam blueprint
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.