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Q: Which of the following is a single user operating system?
  • A. Windows 7
  • B. MS-DOS
  • C. Windows NT
  • D. Linux
Correct Answer: Option B - Single-user (Single - Tasking OS) is an operating system that allows a single user to perform only one task at a time. Examples of single user operating system is MS - DOS, Palm OS etc.
B. Single-user (Single - Tasking OS) is an operating system that allows a single user to perform only one task at a time. Examples of single user operating system is MS - DOS, Palm OS etc.

Explanations:

Single-user (Single - Tasking OS) is an operating system that allows a single user to perform only one task at a time. Examples of single user operating system is MS - DOS, Palm OS etc.