Explanation

According to the AWS Shared Responsibility Model:

AWS is responsible for "Security OF the Cloud":

• A. Securing the virtualization layer - AWS manages the security of the underlying infrastructure including the hypervisor, physical hosts, and network infrastructure.
• D. Patching the operating system on Amazon RDS instances - For managed services like Amazon RDS, AWS is responsible for patching the operating system and database software.

Customer is responsible for "Security IN the Cloud":

• B. Patching the operating system on Amazon EC2 instances - For EC2 instances (IaaS), customers are responsible for patching the guest operating system.
• C. Enforcing a strict password policy for IAM users - Customers manage IAM policies and user access controls.
• E. Configuring security groups and network ACLs - Customers configure network security controls for their resources.

Key Points:

• AWS Responsibility: Physical security, infrastructure security, managed service maintenance
• Customer Responsibility: Data security, application security, IAM management, EC2 instance management
• Managed Services (like RDS): AWS handles more of the operational responsibilities including OS patching
• Infrastructure Services (like EC2): Customer handles more of the operational responsibilities