Which of the following is an Over-voltage condition? (Choose all that apply)

A.
A spike

B.
Sags

C.
Brownouts

D.
A surge.

Explanation:
Over-voltage conditions are known as surges and spikes.
Incorrect Answers:
B, C: When the power supply drops below normal levels, sags and brownouts occur.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 227-240.