正解:A
Time Machine (Option A) is macOS's built-in backup application. It allows users to automatically back up their entire system, including apps, music, photos, emails, and system files. Time Machine provides an easy way to restore files from a previous state or recover from a system failure.
* FileVault (Option B) is used for encrypting data, not for backups.
* Keychain (Option C) is a password management tool.
* Mission Control (Option D) manages open windows and desktops but has no backup functionality.
CompTIA A+ Core 2 References:
* 1.10 - Features and tools of macOS, including backup options like Time Machine.