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

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

Internal commands can be run whenever the DOS prompt is displayed
Internal commands are stored on disk separately from COMMAND.COM
Internal commands are reserved for DOS-level programming
Internal commands can only be executed from a batch file

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