Which of the followings is correct?
a. A band-limited signal that has been sample at sampling rate more than twice of the bandwidth of the signal is reproducible from its samples.
b. To appropriately sample a signal using a pulse instead of impulse, the sampling rate must be more than the minimum sampling rate.
c. In Companding, the Compressor is used at transmitter's codec and the Expander is used in receiver's Codec
d. All of the above