Which SCP is automatically applied to every organization root in AWS Organizations?

The correct choice is based on the idea that specific service control policies (SCPs) are automatically associated with every organization root in AWS Organizations. The policy that is inherently applied as a default allows access to all services, thereby enabling full permissions.

The FullAWSAccess SCP is designed to give organizations a baseline level of access across all AWS services and resources. This is crucial for organizations as it allows them to effectively implement and manage permissions without unnecessary restrictions that could hinder the functionality of services widely used in AWS. It ensures that every account under the organization root can leverage the full capabilities of AWS, unless overridden by more restrictive SCPs applied at the organizational unit or account level.

In contrast, the other choices refer to various types of policies that might not serve as default SCPs automatically applied at the organization root level. For example, policies like DefaultServiceControlPolicy may serve other functions or contexts but do not embody the principle of granting full access across the organization by default. Understanding the specific roles and default behaviors of these policies is essential for managing permissions and security in AWS effectively.