Final answer:
The automated tag-out system used on board the NIMITZ is the 3M AutoSec. It improves safety and efficiency by managing maintenance notifications digitally.
Step-by-step explanation:
The system used on board the NIMITZ for automated tag-outs is known as c) 3M AutoSec. This system is designed to ensure that maintenance and operations on various systems can be done safely by managing 'tag-outs', which are essentially notices or locks placed on equipment to indicate that it is under maintenance, should not be operated, or requires caution before use. The 3M AutoSec system streamlines the traditional manual process of tag-outs with a computerized, automated system to enhance efficiency and safety.