AWS Certified Cloud Practitioner — Question 403

A company moves a workload to AWS to run on Amazon EC2 instances. The company needs to run the workload in the most cost-effective way.

What can the company do to meet this requirement?

Answer options

• A. Use AWS Key Management Service (AWS KMS).
• B. Use multiple AWS accounts and consolidated billing.
• C. Use AWS CloudFormation to deploy the infrastructure.
• D. Rightsize all the EC2 instances that are used in the deployment.

Correct answer: D

Explanation

Rightsizing EC2 instances directly reduces costs by aligning instance sizes and configurations with actual workload performance requirements, preventing over-provisioning. While consolidated billing simplifies invoicing and CloudFormation automates deployments, they do not optimize the resource sizing of individual workloads. AWS KMS is a security service and does not contribute to cost reduction.