What should be done to all external ground rods or earth connections?

Answer: C. Bond them together with heavy wire or conductive strap

All external ground rods or earth connections should be bonded together with heavy wire or conductive strap. This keeps them at the same voltage so dangerous currents don't flow between them during a lightning strike or electrical fault. Ground rods do not get tuned like antennas.

Tip: Bond all grounds together.