In Pulse Position Modulation _________

Multiple Choice

In pulse position modulation _________.

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