____ is the process of sending data over a signal by varying either its amplitude, frequency, or phase.

____ is the process of sending data over a signal by varying either its amplitude, frequency, or phase.

____ is the process of sending data over a signal by varying either its amplitude, frequency, or phase. 





a. Digital encoding
b. Amplification
c. Modulation
d. Attenuation





Answer: C


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