Adigital communication link carries binary-coded words representing samples of an input signalxa(t) = 3 cos(600πt) + 2 cos(1800πt).the link is operated at 10,000 bits/s and each input sample is quantized into 1024 different voltage levels. a) what are the sampling frequency and the folding frequency? b) what is the nyquist rate for the signal xa(t)? c) what are the frequencies in the resulting discrete-time signal x[n]? d) what is the resolution?