Which Microsoft operating system is known for its graphical user interface?

The Microsoft operating system recognized for its graphical user interface is Windows. Introduced in the 1980s, Windows revolutionized the way users interacted with their computers by providing a graphical interface instead of solely relying on text-based commands. This user-friendly design allows users to navigate the operating system through visual elements like windows, icons, and menus, making tasks more intuitive and accessible for those who may not be familiar with command-line interfaces.

In contrast, the other options mentioned do not primarily feature a graphical user interface or are not Microsoft products. DOS is primarily a text-based operating system that requires users to enter commands through a command line. OS/2, while capable of supporting a graphical user interface, was developed by IBM and is not a Microsoft operating system. Unix, traditionally also command-line oriented, has several variants that can support graphical environments, but it is not known as a Microsoft OS. Thus, Windows stands out as the clear choice for its widespread use of a graphical user interface, making it synonymous with user-friendly computing in the Microsoft ecosystem.