Which AWS service provides resizable virtual servers in the cloud on which you can run applications?
- AAmazon RDS
- BAmazon EC2正确
- CAmazon S3
- DAWS Lambda
为什么: Amazon EC2 (Elastic Compute Cloud) provides resizable virtual servers, called instances, where you control the operating system and software. S3 is object storage, RDS is a managed database, and Lambda runs code without provisioning servers.

