AWS Certified Cloud Practitioner (CLF-C02) — Question 262

A company wants to run a simulation for 3 years without interruptions.

Which Amazon EC2 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: B

Explanation

The most cost-effective option for a long-term simulation like this is Reserved Instances, as they offer significant savings over the On-Demand pricing model when committing to a 1 or 3-year term. Spot Instances can be cheaper but are not reliable for uninterrupted usage, while Dedicated Hosts are typically more expensive and not necessary for this scenario.