Which of the following can cause shielded cables to radiate or receive interference?

Coaxial cables and other shielded lines are designed to contain RF energy inside the cable. This works properly when the current on the center conductor is exactly equal and opposite to the current on the inside of the shield, known as differential-mode current. However, if an imbalance occurs—such as from a poorly matched antenna or lack of a balun—RF current can begin to flow on the outside of the shield. This is called common-mode current. When common-mode current flows on the exterior of the shield, the shield itself begins to act as an antenna, freely radiating the signal or picking up local interference. Low inductance grounds (Option A) and standard braided shielding (Option C) are actually good engineering practices that help prevent or mitigate interference, not cause it.