Joe Has read and write access to his own home directory. Joe and Ann are collaborating on a
project, and Joe would like to give Ann write access to one particular file in this home directory.
Which of the following types of access control would this reflect?

A.
Role-based access control

B.
Rule-based access control

C.
Mandatory access control

D.
Discretionary access control

Explanation:
Discretionary access control (DAC) allows access to be granted or restricted by an object’s owner
based on user identity and on the discretion of the object owner.