What is the main purpose of using a low-pass filter in a digital system?

A) To remove high-frequency noise

B) To enhance high-frequency signals

C) To increase the amplitude of a signal

D) To sample the signal

Answer: A) To remove high-frequency noise

Explanation: A low-pass filter allows low-frequency signals to pass through while attenuating high-frequency noise, making it essential for signal cleaning and enhancing the quality of the desired signal.