Which of the followings is true?
A. For FM, a sinusoidal phase deviation and a frequency deviation constant can be deployed to compute the message.
B. For PM, a sinusoidal phase deviation can be deployed to compute the message.
C. For PM, a sinusoidal phase deviation and a frequency deviation constant can be deployed to compute the message.
D. For PM, a phase deviation constant can be deployed to compute the message.