Which keys can be pressed quit without saving in DOS

Which keys can be pressed quit without saving in DOS

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1) While working with MS-DOS, which command is used to copy all files from the currently logged drive and directory with the extension .TXT to the drive A?

2) Which command is used to make a new directory?

3) Which command is used to clear the screen

4) Which file executes commands in DOS?

5) To copy the file command.com from drive c: to drive a: