AWS Certified Cloud Practitioner (CLF-C02) — Question 549

A company needs to host a web server on Amazon EC2 instances for at least 1 year. The web server cannot tolerate interruption.

Which EC2 instance purchasing option will meet these requirements MOST cost-effectively?

Answer options

• A. On-Demand Instances
• B. Partial Upfront Reserved Instances
• C. Spot Instances
• D. No Upfront Reserved Instances

Correct answer: B

Explanation

Reserved Instances are ideal for continuous workloads with a committed term of 1 or 3 years, whereas Spot Instances are unsuitable because they can be interrupted. Among the Reserved Instance payment options listed, Partial Upfront Reserved Instances provide a higher discount than No Upfront Reserved Instances, making them the most cost-effective choice compared to On-Demand and No Upfront options.