Which of the following can cause overheating?

A.
Frequency variation

B.
Electrical line noise

C.
Harmonic distortion

D.
None of the above

Explanation:
Harmonic distortions can cause overheating, hardware damage, and communication errors.
Incorrect
Answers:
A: It can damage the sensitive electronic equipment.
B: Electrical line noise is either chronic or intermittent high-frequency interference with the smooth sine wave expected from utility power.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 227-240.