Technician exam question T4A08

WhyFlat copper strap is the preferred conductor for bonding at RF. At RF, current crowds toward a conductor's surface, so a wide, flat strap presents far less inductance than a round wire of the same length, making flat copper strap the preferred bonding conductor at RF, answer D. Copper braid stripped from coax (A) works acceptably but isn't preferred over strap, copper-clad steel (B) is a poor RF conductor chosen for antenna wire strength rather than bonding, and twisted pair (C) adds inductance that works against a low-impedance RF ground path.