Your organization is leveraging Amazon EC2 instances and Amazon S3 storage for its new web application. Which of the following would be AWS's responsibility according to the AWS shared responsibility model?
Physical security of the data centers where EC2 and S3 hardware is housed.
Encrypting sensitive data stored in S3 buckets.
Implementing a firewall configuration for the EC2 instances.
Patch management of the EC2 instance's guest operating system.