Which of the following could you use to cure distorted audio caused by RF current on the shield of a microphone cable?

When stray RF current travels along the outside shield of a microphone cable, it can enter the transmitter's audio circuits and cause distorted or buzzy audio. A ferrite choke, or ferrite bead, acts as an inductor when clamped around the cable. It creates a high impedance to radio frequency currents flowing on the outside of the shield, effectively blocking the RF without affecting the internal audio signals. Band-pass and low-pass filters are used to manage frequencies passing through a primary signal path, like an antenna feedline, not stray currents on a cable shield. A preamplifier would simply boost signals and potentially make the interference worse. Therefore, a ferrite choke is the best practical solution for common-mode RF on cables.