A reasonable approximation for the signal speed in 100 ohm balanced twisted pair cable is__________, where c is the velocity of light in free space.

A reasonable approximation for the signal speed in 100 ohm balanced twisted pair cable is__________, where c is the velocity of light in free space.
A . 0.2 c
B . 0.4 c
C . 0.6 c
D . 08 c
E . 0.9 c

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Answer: C