Which task is the responsibility of AWS, according to the AWS shared responsibility model?

Explanations:

Applying guest operating system patches to Amazon EC2 instances is the responsibility of the customer, as they manage the operating system and applications running on their EC2 instances.

Providing monitoring of human resources information management (HRIM) systems is not related to AWS’s responsibilities; it is the customer’s responsibility to monitor their own applications and data hosted on AWS.

Performing automated backups of Amazon RDS instances is a shared responsibility, but AWS provides automated backup features. While customers can configure and manage these backups, the underlying infrastructure and availability are managed by AWS.

Optimizing the costs of running AWS services is primarily the customer’s responsibility, as they need to select the right services, instance types, and configurations to optimize costs based on their usage patterns.