Which operating system is developed by Microsoft?

The choice of Windows is correct because it is an operating system that has been developed and maintained by Microsoft since its initial release in 1985. Windows is designed to provide a graphical user interface (GUI), making it user-friendly and widely adopted in both personal and business computing environments. Throughout its history, Windows has evolved through various versions, from Windows 1.0 to the latest iterations like Windows 11, integrating features like multitasking, networking capabilities, and support for a wide range of hardware.

The other options represent different operating systems developed by other entities; for example, OSX is developed by Apple for their Mac computers, Linux is a family of open-source operating systems created by the community, and Unix is a powerful multiuser operating system originally developed in the 1960s and 1970s at Bell Labs. Each of these systems has its own unique features and target audiences, but they are not associated with Microsoft's development efforts.