What must the Cloud Engineer ensure when adding a role for resources calling AWS services?

When adding a role for resources calling AWS services, ensuring that a policy dependency is included is crucial. In AWS, roles are used to grant specific permissions to resources so they can perform actions on your behalf. A policy, which defines what actions are allowed or denied, must be associated with the role to establish the necessary permissions.

By adding a policy dependency to the role, the Cloud Engineer specifies what AWS services and actions the resources are permitted to use. This is fundamental for maintaining security, as it delineates the exact capabilities that a resource has when interacting with AWS services, thus following the principle of least privilege.

The other options do not accurately reflect the necessary requirements for managing roles in AWS. While internet access can be important for certain types of resources, such as instances that require external connectivity to interact with AWS services, it's not a strict requirement for all resources using roles. The role does not need to be public, as roles are typically designed to be accessible only to specific resources or accounts. Furthermore, multiple resources can utilize the same role, facilitating efficient permission management across various AWS resources.