A band-rejection filter is one that _____.

A) passes frequencies below a certain point
B) passes frequencies above a certain point
C) passes a range of frequencies while rejecting frequencies on either side
D) can be narrow band or wide band

A band-rejection filter, also known as a notch filter or band-stop filter, is designed to block a specific range of frequencies while allowing frequencies outside of that range to pass. This functionality can be implemented in a narrow band, affecting a small range of frequencies, or in a wide band, affecting a larger range of frequencies.