What is the role of a filter in a signal conditioning block, and how do you choose a cutoff frequency?

• A. Filter delays the signal but does not affect frequencies.
• B. Filter is not relevant to signal conditioning.
• C. Filter removes unwanted frequencies; choose a cutoff that preserves the signal bandwidth while attenuating noise and interference.
• D. Filter converts the signal from analog to digital with no cutoff choice.

Answer: (C)