Explanation:

An operating system (OS) is software that manages computer hardware and software resources and provides common services for computer programs. LINUX, UNIX, and WINDOWS are all prominent and widely used examples of operating systems. LINUX is a family of open-source Unix-like operating systems. UNIX is a family of multitasking, multi-user computer operating systems. WINDOWS (e.g., Windows 10, Windows 11) is a series of graphical operating systems developed by Microsoft. MS Office (Microsoft Office) is a suite of application software, including programs like Word, Excel, and PowerPoint, designed for productivity tasks. It is not an operating system itself, but rather runs *on* an operating system. Therefore, MS Office is NOT an example of an Operating System.