PLZ HELP

Identify three ways we use analog and digital signals in our everyday lives.

a
Analog signals are used to record video and transmit television signals
b
The wireless router converts digital information from a computer or internet source and transmits it as radio waves, then the computer converts the radio waves back to digital signals
c
A cell phone converts your voice into an electrical (digital) signal, which is then transmitted via radio waves (analog signals) to the nearest cell tower
d
All of the above