What does the term "group delay" refer to?

A) The time delay experienced by a signal as it passes through a filter

B) The total time taken for a signal to travel from input to output

C) The difference in delay between different frequency components

D) The delay caused by quantization

Answer: A) The time delay experienced by a signal as it passes through a filter

Explanation: Group delay measures the time delay of the amplitude envelopes of various sinusoidal components of a signal as they pass through a filter. It is an important characteristic in understanding signal processing effects.