Which of the following is a benefit of using a callback device?

A.
Provides an audit trail

B.
Can be used in a switchboard environment

C.
Permits unlimited user mobility

D.
Allows call forwarding

Explanation:
A callback feature hooks into the access control software and logs all authorized and unauthorized access attempts, permitting the follow-up and further review of potential breaches. Call forwarding (choice D) is a means of potentially bypassing callback control. By dialing through an authorized phone number from an unauthorized phone number, a perpetrator can gain computer access. This vulnerability can be controlled through callback systems that are available.