Final answer:
The physical act of mating/un-mating components to or from an AUR configuration is identified by Work Task Code 121.
Step-by-step explanation:
The physical act of mating/un-mating components to or from an AUR configuration is identified by the Work Task Code 121. This code is used in the field of engineering to track and document the specific task of connecting or disconnecting components in an AUR (Assemble/Unassemble/Reassemle) configuration.