AWS Certified Cloud Practitioner (CLF-C02) — Question 10

Which Amazon EC2 pricing model is the MOST cost efficient for an uninterruptible workload that runs once a year for 24 hours?

Answer options

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

Correct answer: A

Explanation

On-Demand Instances are the most cost-efficient choice for a workload that runs infrequently, as they allow you to pay for compute capacity by the hour without any long-term commitment. Reserved Instances would not be economical given the infrequent use, while Spot Instances could lead to interruptions, and Dedicated Instances are typically more expensive and unnecessary for this scenario.