All metal electrical equipment in the RV's 120 VAC electrical system must always be _____________________________.

The correct answer is grounded. In an RV's 120 VAC electrical system, grounding is crucial for safety. It provides a path for electrical currents to safely dissipate in case of a fault, such as a short circuit. This helps prevent electrical shocks, reduces the risk of fire, and protects the RV's electrical components.

Grounding ensures that any stray voltage or excess current has a safe route to the ground instead of passing through the equipment or the occupants of the RV. The grounding system typically connects to the metal chassis of the RV and, when connected properly, it helps ensure that any electrical faults do not pose risks to users.

While bonding or connecting might be important for other aspects of an electrical system, it is the grounding that specifically addresses the safety concerns associated with 120 VAC electrical equipment. Bonding refers more to the connection between different points within an electrical system to ensure they are at the same potential, while connecting generally pertains to linking various components but does not specifically entail the safety measures provided by grounding.