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Q: In which year was Microsoft's Windows operating system first introduced?
  • A. 1991
  • B. 1985
  • C. 1993
  • D. 1989
Correct Answer: Option B - The first version of Microsoft's Windows operating system is released on November, 1985.
B. The first version of Microsoft's Windows operating system is released on November, 1985.

Explanations:

The first version of Microsoft's Windows operating system is released on November, 1985.