ch16-1Which of the following best describes the function of demodulation by a modem?
(A) Encoding an incoming analog signal from the PC as a digital signal for transmis-sion into the PSTN
(B) Decoding an incoming digital signal from the PSTN into an analog signal
(C) Encoding a set of binary digits as an analog electrical signal
(D) Decoding an incoming analog electrical signal from the PSTN into a digitalsignale. Encoding a set of binary digits as a digital electrical signal