The main factor that determines the accuracy of a reconstructed PCM signal is the:(A) Signal…

The main factor that determines the accuracy of a reconstructed PCM signal is the:(A) Signal bandwidth(B) Pulse repletion rate(C) Pulse amplitude(D) Number of bits used for quantizationWhich one of the following scheme is a digital modulation technique?(A) Pulse code modulation (B) On-off keying(C) Pulse width modulation (D) Delta modulation