To properly execute a macro, which of the following must be enabled?

To properly execute a macro in the context of FANUC systems, having macro execution permission enabled is crucial. This permission ensures that the system allows macros to be run by the user or the application. Without this permission, an attempt to execute a macro will be rejected, resulting in an error or the macro not functioning at all.

The other options, while important in their own contexts, do not directly pertain to the execution of macros. User access control relates to managing who has access to specific system functions but does not specifically govern macro execution. Macro logging is used to track the execution of macros for review or debugging purposes but is not a prerequisite for running them. Safety mode is a mode that may limit certain operations for protection and is unrelated to the permission aspect necessary for macro execution. Thus, ensuring macro execution permission is enabled is the definitive requirement for running a macro successfully.