Sound waves are picked up by a speaker and converted to a small og voltage called the audio signal, then the voltage are sent to the microphone.
B.
Sound waves are picked up by a microphone and converted to a small og voltage called the audio signal, then the voltage are sent to the speaker.
C.
Sound waves are picked up by a microphone and converted to a small digital voltage called the audio signal, then the digital voltage are sent to the speaker.