Disc Operating System (DOS)
While working with 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 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 must always be used with the /e switch
External commands are stored on disk separately from COMMAND.COM
External commands can only be executed from a batch file.
External commands reside in RAM until called

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