E4D03:What creates intermodulation interference between two repeaters in close proximity?
Direct answer summary (2024-2028 NCVEC pool)
The official correct answer for E4D03 is The output signals mix in the final amplifier of one or both transmitters.
The key fact is The output signals mix in the final amplifier of one or both transmitters. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.