Disc Operating System (DOS)
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?

COPY *.TXT C:
COPY A: *.TXT
COPY *.TXT ALL.TXT
COPY *.TXT A:

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

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

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