What is the MOST effective access control method to prevent users from sharing files with
unauthorized users?

A.
Mandatory

B.
Discretionary

C.
Walled garden

D.
Role-based

Explanation:

Mandatory access controls restrict access to files based on the security classification of the file.
This prevents users from sharing files with unauthorized users. Role-based access controls grant
access according to the role assigned to a user; they do not prohibit file sharing. Discretionary and
lattice-based access controls are not as effective as mandatory access controls in preventing file
sharing. A walled garden is an environment that controls a user’s access to web content and
services. In effect, the walled garden directs the user’s navigation within particular areas, and does
not necessarily prevent sharing of other material.