An organization has implemented a hierarchical-based concept of privilege management in which
administrators have full access, HR managers have less permission than the administrators, and
data entry operators have no access to resources. Which of the following access control models is
implemented in the organization?

A.
Role-based access control (RBAC)

B.
Network-based access control (NBAC)

C.
Mandatory Access Control (MAC)

D.
Discretionary access control (DAC)