Sine Wave Clock Pulses Are Not Appropriate for Most Clock

Multiple Choice

Sine wave clock pulses are not appropriate for most clock inputs because:

A) the negative going portion of the waveform would reverse bias input circuitry and cause circuit failure.
B) the negative going waveform would introduce unwanted noise.
C) sine waves have no defined on/off values.
D) off would not be at ground potential. It would have a negative potential.
E) C or D