正解:C
macOS Server features (e.g., Profile Manager, file sharing) are supported on Mac computers running macOS.
While macOS Server as a standalone app was discontinued after macOS 10.13, its features were integrated into macOS itself starting with 10.14 (Mojave) and later. iPads (option A), iPhones (option B), and Apple Watches (option D) don't support macOS Server functionality, as they run different operating systems.
TheApple Platform Deployment Guidespecifies macOS requirements for these features.
Reference:Apple Platform Deployment Guide(Chapter: macOS Server).