A malicious person gained access to a datacenter by ripping the proximity badge reader off the wall near
the datacenter entrance. This caused the electronic locks on the datacenter door to release because the:

A.
badge reader was improperly installed.

B.
system was designed to fail open for life-safety.

C.
system was installed in a fail closed configuration.

D.
system used magnetic locks and the locks became demagnetized.

Explanation:
It describes a design the lock to fail open for life safety, causing the door to stay open when power is lost
– in this case the proximity badge reader was ripped off the wall.
Incorrect Answers:
A: Upon use of the proximity reader and granting access to the room – it can be assumed that installation
was correct.
C: A fail-close design will keep the lock engaged.
D: The question mentions that the proximity reader was ripped off the entrance wall and not magnetic
locks that became demagnetized.
http://www.nortechcontrol.com/access-control/what-is-access-control/access-control-ineducation/what-are-proximity-readers.aspx
http://en.wikipedia.org/wiki/Fail-safe
Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis,
2014, p. 367