Which of the following are aspects of the AWS shared responsibility model? (Choose two.)

A. Configuration management of infrastructure devices is the customer's responsibility.
B. For Amazon S3, AWS operates the infrastructure layer, the operating systems, and the platforms.
C. AWS is responsible for protecting the physical cloud infrastructure.
D. AWS is responsible for training the customer's employees on AWS products and services.
E. For Amazon EC2, AWS is responsible for maintaining the guest operating system.