What is the possible method used in Quadrature oscillator to remove distortion from the output waveform?

• A. Replace the resistor at the input of non-inverting type amplifier with a potentiometer
• B. Replace the resistor at the output of non-inverting type amplifier with a potentiometer
• C. Replace the resistor at the input of inverting type amplifier with a potentiometer
• D. None of the mentioned