Under the AWS shared responsibility model, which task is the responsibility of AWS?

The correct answer is applying updates to the Nitro Hypervisor. Under the shared responsibility model, AWS is responsible for the security of the cloud, which includes the underlying infrastructure, hardware, software, networking, and facilities that run AWS services. The Nitro Hypervisor is a core component of the AWS infrastructure for EC2 instances, and its maintenance and updates fall squarely on AWS. Enabling client-side encryption for objects stored in Amazon S3 is a customer responsibility, as it involves configuring the data in the cloud. Configuring IAM policies to follow the principle of least privilege is also a customer responsibility, as it pertains to access management within the cloud. Patching the guest operating system on an Amazon EC2 instance is a customer responsibility because the customer manages the operating system on the EC2 instance.