Select the True Statement Regarding Analog and Digital Signals

Select the true statement regarding analog and digital signals.

A) Analog signals vary over time continually and can be represented by a sine wave,while digital signals are binary 1s and 0s using voltage levels.
B) Digital signals vary over time continually and can be represented by a sine wave,while analog signals are binary 1s and 0s using voltage levels
C) A modem is not required to use a line that uses analog signals.
D) On fiber optic media,a 1 bit can be represented as a pulsing analog signal.