In
which of the following access control models, owner of an object decides who is allowed to access
the object and what privileges they have?

A.
Access Control List (ACL)

B.
Mandatory Access Control (MAC)

C.
Role Based Access Control (RBAC)

D.
Discretionary Access Control (DAC)

Explanation:
Discretionary access control (DAC) model has an access policy determined by the
owner of an object. The owner decides who is allowed to
access the object and what privileges they have.
Answer option B is incorrect. Mandatory Access Control (MAC) is a model that uses a predefined set
of access privileges for an object of the
system. Access to an object is restricted on the basis of the sensitivity of the object and granted
through authorization. Sensitivity of an
object is defined by the label assigned to it. For example, if a user receives a copy of an object that is
marked as “secret”, he cannot grant
permission to other users to see this object unless they have the appropriate permission.
Answer option C is incorrect. Role-based access control (RBAC) is an access control model. In this
model, a user can access resources
according to his role in the organization. For example, a backup administrator is responsible for
taking backups of important data. Therefore,
he is only authorized to access this data for backing it up. However, sometimes users with different
roles need to access the same resources.

This situation can also be handled using the RBAC model.
Answer option A is incorrect. An access control list (ACL) model has a list of permissions attached to
an object. The list specifies who or what is
allowed to access the object and what operations are allowed to be performed on the object.