Answer :

Final answer:

The cut ends of IMC and RMC, types of electrical conduit, must be threaded to allow for the secure attachment of connectors and couplings.

Explanation:

All cut ends of IMC (Intermediate Metal Conduit) and RMC (Rigid Metal Conduit), which are types of electrical conduit, must be threaded. This means option a) Threaded is the right choice. Threading allows for the secure attachment of connectors and couplings to the conduit, ensuring a firm and safe installation. Both IMC and RMC are robust types of electrical conduit often employed in commercial and industrial settings, suitable for complex electrical systems. It's essential to properly thread them in order to ensure safety and functionality within these systems.

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