Which of the following definitions of serverless computing BEST explains how it is different from using VMs?

A. Serverless computing is a cloud-hosting service that utilizes infrastructure that is fully managed by the CSP.
B. Serverless computing uses predictable billing and offers lower costs than VM compute services.
C. Serverless computing is a scalable, highly available cloud service that uses SDN technologies.
D. Serverless computing allows developers to focus on writing code and organizations to focus on business.