Which of the following technique is used in high speed modem ?

[ A ]    TDM
[ B ]    PCM
[ C ]    QAM right
[ D ]    FDM
[ E ]    None of these
Answer : Option C
Explanation :
QAM (Quadrature Amplitude Modulation), is the modulation scheme used in cable plants. RAM is how the modem encodes digital information to be sent over the RF interface of the modem.