Which of the following is TRUE, with regards to the physical security at the Entrance?

A.
A less inexpensive form of authentication is the retinal scan.

B.
A more expensive form of authentication is the miscellaneous characters

C.
To best secure the computer systems do not need to lock the server racks, because there are locks on the doors.

D.
A more expensive form of authentication is key cards.

Explanation:
To use the key cards is one of the more expensive than the other forms of authentication, because it is the expenses of the software involved.
Incorrect
Answers:
A: The retinal scan is one of the more expensive forms of authentication.
B: This password is less sophisticated and less expensive than alternate forms.
C: The keys can fall into the wrong hands, so it is needed to lock the server racks.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, p. 464.