What does the term "bit depth" refer to in digital audio processing?

A) The duration of a sound

B) The number of bits used to represent each audio sample

C) The frequency of the audio signal

D) The number of channels in audio

Answer: B) The number of bits used to represent each audio sample

Explanation: Bit depth determines the resolution of each audio sample in digital audio processing, with higher bit depths allowing for more detailed representation of the audio signal and better dynamic range.