The key fact is Adding a clip-on ferrite “choke” to the microphone cable to prevent the transmitted signal from feeding back into the transmitter. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
The official correct answer for T7B11 is Adding a clip-on ferrite “choke” to the microphone cable to prevent the transmitted signal from feeding back into the transmitter.
The key fact is Adding a clip-on ferrite “choke” to the microphone cable to prevent the transmitted signal from feeding back into the transmitter. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.