In a long-distance RF link, what statement about Fade Margin is true?

In a long-distance RF link, what statement about Fade Margin is true?
A . Fade Margin is an additional pad of signal strength designed into the RF system to compensate for unpredictable signal fading.
B . The Fade Margin of a long-distance radio link should be equivalent to the receiver’s antenna gain.
C . A Fade Margin is unnecessary on a long-distance RF link if more than 80% of the first Fresnel zone is clear of obstructions.
D . The Fade Margin is a measurement of signal loss through free space, and is a function of frequency and distance.

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Answer: A