Disc Operating System (DOS)
While working with MS-DOS which command is used to change the extension of all filenames ending with .txt to .doc?

Ren *.doc *.txt
Ren a: *.doc *.txt
Ren file.doc file.txt
Ren *.txt *.doc

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Disc Operating System (DOS)
Which of the following applies to external DOS commands?

External commands are stored on disk separately from COMMAND.COM
External commands must always be used with the /e switch
External commands can only be executed from a batch file.
External commands reside in RAM until called

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