Q$1)$ How does the use of multiple frequencies in FSK differ from the use of multiple amplitudes in ASK?

A$.$ FSK uses multiple frequencies to represent different data values, while ASK uses multiple amplitudes to represent different data values.

B$.$ FSK uses multiple frequencies to encode data, while ASK uses multiple amplitudes to decode data.

C$.$ FSK uses multiple frequencies to transmit data over long distances, while ASK uses multiple amplitudes to transmit data over short distances.

D$.$ FSK uses multiple frequencies to transmit data over a wide bandwidth, while ASK uses multiple amplitudes to transmit data over a narrow bandwidth.