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

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

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

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