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Q: Which of the following is not Operating System
  • A. Windows Vista
  • B. Linux
  • C. Microsoft office
  • D. Apple's IOS
Correct Answer: Option C - Microsoft office is an application software. While Linux, Windows Vista and Apple's IOS are operating system.
C. Microsoft office is an application software. While Linux, Windows Vista and Apple's IOS are operating system.

Explanations:

Microsoft office is an application software. While Linux, Windows Vista and Apple's IOS are operating system.