Discussion
What must a balanced cable do for that rejection to work?
Answer: C
The rejection depends on the interference being genuinely common, so the two conductors must be twisted together and see the same field, which is what a twisted pair achieves. Low impedance to earth, single-ended carriage and characteristic termination describe other arrangements. A technique that discards what is common only works if the unwanted signal really is common, and the cable is what makes it so.
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