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

A.
Provide an audit trail

B.
Can be used in a switchboard environment

C.
Permit unlimited user mobility

D.
Allow 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.