Which of the following security concepts is accomplished with the installation of a RADIUS server?

A RADIUS (Remote Authentication Dial-In User Service) server provides centralized Authentication, Authorization, and Accounting (AAA) services. Authentication verifies the user's identity, Authorization determines what resources the user can access, and Accounting tracks user activity. Therefore, installing a RADIUS server directly accomplishes AAA. CIA (Confidentiality, Integrity, Availability) is a fundamental security triad, but RADIUS is a tool that helps achieve aspects of CIA, not the concept itself. ACL (Access Control List) defines permissions for resources, which is a component of authorization, but ACLs are not the overarching concept that RADIUS provides. PEM (Privacy-Enhanced Mail) is a standard for securing email and is unrelated to RADIUS server functionality.