AWS Certified Cloud Practitioner (CLF-C02) — Question 717

A company has an on-premises application. The application has processing times of less than 5 minutes and is invoked only a few times each day. The company wants to move the application to the AWS Cloud.

Which AWS service will support this application MOST cost-effectively?

Answer options

• A. Amazon Elastic Container Service (Amazon ECS)
• B. AWS Lambda
• C. Amazon Elastic Kubernetes Service (Amazon EKS)
• D. Amazon EC2

Correct answer: B

Explanation

AWS Lambda is the most cost-effective option because it is a serverless compute service where billing is based strictly on the execution duration and number of requests, resulting in zero cost when the application is idle. On the other hand, Amazon EC2, Amazon ECS, and Amazon EKS require running instances or cluster management infrastructure that incurs ongoing charges even when no tasks are executing.