What describes the implementation of user permissions in RBAC?

The implementation of user permissions in Role-Based Access Control (RBAC) is best described by the notion of dynamic assignment based on administrator rules. In RBAC, permissions are assigned to roles, and users are granted access to these roles based on their responsibilities within an organization. This allows system administrators to define what actions or resources a user can access depending on their role, which can change dynamically as administrative needs evolve or as users change positions within the organization.

This mechanism allows for flexibility and control in managing user permissions, ensuring that users only have access to the information and resources they need to perform their job functions while maintaining the principle of least privilege. By using dynamic assignment, RBAC can adjust user access in response to changing organizational structures or policies, effectively enhancing security and operational efficiency.