Disc Operating System (DOS)
While working with MS-DOS which command is used to copy all files with extension .txt into one file named all.txt?

Copy *.txt a:
Copy a: *.txt
Copy *.txt all.txt
Copy *.txt c:

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

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
External commands must always be used with the /e switch

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