In pulse position modulation ________
A) the position of a pulse relative to a reference signal varies based upon its amplitude relative to the amplitude of the modulating signal
B) the position of a pulse relative to a reference signal varies based upon the value of the modulating signal
C) the amplitude of a pulse varies based upon its position relative to the zero-crossing of the modulating signal
D) the frequency of a pulse waveform varies based upon the position of the zero-crossing of the modulating signal relative to a reference signal
B
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