What is an Electrical line noise?

What is an Electrical line noise?

A.
The Electrical line noise changes the frequency stability of the 60-cycle AC generation is potentially damaging to sensitive electronic equipment.

B.
Electrical line noise is either chronic or intermittent high-frequency interference with the smooth sine wave expected from utility power.

C.
The Electrical line noise is a very brief under-voltage,shorter than a spike, and generally measured in nanoseconds.

D.
None of the above

Explanation:
Electrical line noise is either chronic or intermittent high-frequency interference with the smooth sine wave expected from utility power. It can be

triggered by radio frequency or electromagnetic interference from transmitters, SCR-driven printers, generators, welding devices, lightning, or nearby high-voltage lines.
Incorrect Answers:
A: Frequency variation is the changes in the frequency stability of the 60-cycle AC generation is potentially damaging to sensitive electronic equipment.
C: A switching transient is a very brief under-voltage, shorter than a spike, and generally measured in nanoseconds.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 227-240.