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Can anyone help it was actually asked in exam as following:

Which of the following options is not a likely source of electromagnetic interference?
A) power lines
B) motors
C) fiber optic cables
D) microwaves    


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1 Answer

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Let me try to help you with your query.

As per my experience and knowledge 
The correct answer is: ​fiber optic cables


fiber-optic cable, also known as an optical-fiber cable, is an assembly similar to an electrical cable, but containing one or more optical fibers that are used to carry light. The optical fiber elements are typically individually coated with plastic layers and contained in a protective tube suitable for the environment where the cable will be deployed. 
Hope this might help you

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