AWS Certified Cloud Practitioner — Question 536

A company wants to use Amazon EC2 instances to run a stateless and restartable process after business hours.

Which instance purchasing option will meet these requirements MOST cost-effectively?

Answer options

• A. Spot Instances
• B. Reserved Instances
• C. Dedicated Hosts
• D. On-Demand Instances

Correct answer: A

Explanation

Spot Instances are the most cost-effective option for workloads that are stateless and can be restarted if interrupted, offering discounts of up to 90% off On-Demand prices. Reserved Instances require a long-term commitment that is inefficient for short, off-hours tasks, while Dedicated Hosts and On-Demand Instances are significantly more expensive and unnecessary for fault-tolerant processes.