Which of the following is true about "FIR filters"?

A) They can have poles in the z-domain.

B) They always require feedback.

C) They can be designed to have a linear phase response.

D) They are less stable than IIR filters.

Answer: C) They can be designed to have a linear phase response.

Explanation: FIR filters can be designed to have a linear phase response, which preserves the waveform shape of signals, an important characteristic in many applications.