Which of the following is not a User Security role?

The best choice that identifies an option which is not a User Security role is the Application Administrator. In the context of Microsoft Dataverse and the broader Power Platform, User Security roles define the permissions and privileges that users have within the system.

User Security roles typically include roles that determine what users can see and do with data in Dataverse. For example, roles like Delegate, Microsoft Dataverse User, and System Customizer specifically relate to the types of permissions granted to different user accounts. A Delegate can perform actions on behalf of another user; a Microsoft Dataverse User is given access to use the Dataverse; and a System Customizer can make changes to the system customizations and configurations.

On the other hand, the Application Administrator role is typically an administrative role related to application management rather than user-specific permissions. This role focuses on managing applications and services rather than setting user security roles. Hence, it does not qualify as a User Security role in the context of Dataverse.