What does the AWS Shared Responsibility Model define?

Correct answer: Division of security responsibilities between AWS and customers

The AWS Shared Responsibility Model defines the division of security responsibilities between AWS and customers (Option D), where AWS is responsible for security of the cloud, covering the physical infrastructure, hardware, and managed service layers, while customers are responsible for security in the cloud, covering their data, identity management, application configuration, and operating system patching on IaaS resources. Option A is incorrect because the model does not address how compute resources are shared; that is governed by AWS's multi-tenancy and virtualization architecture. Option B is incorrect because resource sharing policies, such as AWS RAM, are operational constructs unrelated to the Shared Responsibility Model. Option C is incorrect because data transfer between regions is a networking and cost topic, not the subject of the Shared Responsibility Model.