In which year the first operating system was developed

In which year the first operating system was developed

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1) What do you type at the DOS command prompt to return back to Windows

2) The deleted file in MS-DOS can be recovered if you use the command mention below immediately, the command is:

3) Which command be used to clear the screen and display the operating system prompt on the first line of the display?

4) You suspect a virus has entered your computer. What will not be affected by the virus?

5) While working with MS-DOS, which command is used to move file from one directory to another?