Which of the following is a Unix-like operating system with a GUI developed for Macintosh computers, known for its roots in Unix?

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Mac OS is the Unix-like operating system developed for Apple Macintosh hardware, and it is renowned for its graphical interface on Macs. Its Unix heritage comes through in macOS, which is built on Darwin—combining the Mach kernel with BSD Unix components—and holds Unix certification, giving it a POSIX-like environment while delivering the familiar Mac GUI. This blend of Macintosh-specific hardware support, a polished GUI, and Unix-based underpinnings is what makes it the right fit. The other options don’t align with this combination: Windows isn’t Unix-like and targets non-Mac hardware; Linux is Unix-like but originated independently for general hardware rather than for Macintosh computers; Unix refers to the broader family rather than Apple’s Mac-oriented system.