[单选题]VHF has an alarm which indicates if the microphone is stuck. If a microphone is in the emission position for more than 30 seconds, an interrupted tone sounds for 5 seconds and the emission is turned off. When master caution of “VHF 1（2）（3） EMITTING” or “HF 1(2) EMITTING” displays, it indicates:
A. Transmitter function fails
B. Transmitter emitting more than 60 seconds
C. Transmitter emitting signal discontinuously

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