Which of the following is not correct in regard to microwave transmissions?

Which of the following is not correct in regard to microwave transmissions?
A . Microwave signals penetrate fog and snow.
B . Microwave signals are transmitted in short radio waves.
C . A large number of microwave signals can be transmitted.
D . Microwave signals travel in curved lines.
E . Microwave signals are not affected by ordinary man-made noise.
F . None of the above.

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Answer: D