What is fading?

A.	Another signal source is producing energy on the channel in which you are trying to operate.
B.	The desired signal reaches the receiving antenna via multiple paths, each of which has a different propagation delay and path loss.
C.	A time-varying change in the path loss of a link with the time variance governed by the movement of objects in the environment, including the transmitter and receiver themselves.
D.	A function of the frequency and should be provided in the cable specification by the vendor.
E.	The minimum signal level for the receiver to be able to acceptably decode the information.
F.	The time delay from the reception of the first instance of the signal until the last instance.