Since Class 3 control circuits permit higher allowable levels of voltage and current than Class 2 control circuits, additional _____ are specified to provide protection against the electric shock hazard.
See answer and applicable Code reference
The correct answer is: b) safeguards
Article 725 covers remote-control, signaling, and power-limited circuits that are not an integral part of a device or appliance. As noted in the definitions section of this Article, since Class 3 circuits allow higher levels of voltage and current than a Class 2 circuit, additional safeguards are specified to provide protection from an electric shock hazard that could be encountered.