Types of operating systems

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Across
  1. 2. It is system software that manages computer hardware and software resources and provides common services for computer programs.
  2. 4. It is a personal computer operating system developed by Microsoft.
Down
  1. 1. It is a series of graphical operating systems developed and marketed by Apple
  2. 3. ......... is a family of free and open-source software operating systems built around the Linux kernel.