AWS Certified Cloud Practitioner — Question 159

An application that is hosted on Amazon EC2 has a steady and consistent workload. The application will operate for at least 1 year.

What is the MOST cost-effective instance purchasing option to meet these requirements?

Answer options

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

Correct answer: B

Explanation

The correct answer is B, Reserved Instances, as they provide significant cost savings for applications with predictable usage over a long time frame. Spot Instances (A) are not reliable for steady workloads due to potential interruptions, On-Demand Instances (C) are more expensive for long-term usage, and Dedicated Hosts (D) are typically used for compliance and licensing needs rather than cost efficiency.