Final answer:
The correct answer is B) Splitter. A splitter is used on a patchbay to distribute a single audio input to multiple outputs, allowing for multiple copies of the signal to be made in parallel.
Step-by-step explanation:
On a patchbay, a splitter allows us to make multiple copies of an audio signal in parallel. The correct answer to this question is B) Splitter. A patchbay splitter is designed to take a single audio input and distribute it to multiple outputs without signal degradation, which is essential in various audio engineering and recording studio applications. Unlike a mixer, which combines multiple audio signals into one, or an amplifier, which boosts the signal's strength, a splitter serves to create additional identical copies of an audio signal. An equalizer is used to adjust the balance of frequency components within an audio signal, which is a different function altogether.