E4D03 (B)
How can intermodulation interference between two repeaters occur?
A. When the repeaters are in close proximity and the signals cause feedback in one or both transmitter final amplifiers 
B. When the repeaters are in close proximity and the signals mix in one or both transmitter final amplifiers
C. When the signals from the transmitters are reflected out of phase from airplanes passing overhead
D. When the signals from the transmitters are reflected in phase from airplanes passing overhead
