Which of the following might be useful in reducing RF interference to audio frequency circuits?

In electronic circuits, capacitors exhibit lower impedance as the frequency of a signal increases. A bypass capacitor leverages this property by providing a direct, low-impedance path to ground for high-frequency radio (RF) signals. When installed in an audio frequency circuit, the bypass capacitor effectively shorts the unwanted RF interference to ground without affecting the much lower-frequency audio signals. The audio signals safely bypass this path because they see the capacitor as a high-impedance barrier. Conversely, an inductor acts as a choke, increasing its impedance with frequency, so a 'bypass inductor' is functionally incorrect for shunting signals to ground. Diodes are generally used for rectification or signal clipping and would distort the audio rather than filter out the RF.