In a certain low-pass filter, fc = 3.5 kHz. Its pass-band is_______________?
A. 0 Hz to 3.5 kHz
B. 0 Hz
C. 3.5 kHz
D. 7 kHz
A. 0 Hz to 3.5 kHz
B. 0 Hz
C. 3.5 kHz
D. 7 kHz