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 c:
Copy *.txt a:
Copy a. *.txt
Copy *.txt all.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 reserved for DOS-level programming
Internal commands can only be executed from a batch file
Internal commands are stored on disk separately from COMMAND.COM

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