You want to save the state of the Mac running macOS. Which tool should be used?

The correct choice is Time Machine because it is the built-in backup software for macOS that allows users to create backups of their entire system, including the state of applications, settings, and files. Time Machine works by continuously backing up the system, enabling users to restore their system to a previous state if needed. It provides a user-friendly interface and incremental backups, making it an effective tool for saving the state of a Mac.

In contrast, System Restore is a feature that's typically associated with Windows operating systems, allowing users to revert the system to a previous state. Force Quit is used to terminate unresponsive applications, not to save or back up the state of the system. Disk Utility is primarily used for disk management tasks such as formatting and repairing disks, rather than for backing up or saving the state of the operating system. Therefore, Time Machine is the most appropriate tool for backing up the state of a Mac running macOS.