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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.