Which macro assignments will execute a macro in manual mode?

The correct choice encompasses the appropriate macro assignments that allow for the execution of a macro while in manual mode. In FANUC systems, the specific key assignments determine the operational mode and functions available.

In this case, the macro assignments of UK (User Key), SU (Service, usually for settings), and MF (Manual Function) are specifically designed to facilitate macro execution in a manual context. The User Key enables users to define custom functionality that can be accessed easily, making it suitable for manual operation. The addition of the Manual Function key reinforces the capability to execute macros without transitioning to an automated process.

This understanding is paramount in the context of operating FANUC systems effectively, especially in scenarios requiring immediate and customizable responses. Thus, this combination of keys provides the best functionality for executing macros during manual operation as specified by the system's design.