While working with MS-DOS which command is used to copy all files with – McqOptions

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1.	While working with MS-DOS which command is used to copy all files with extension .txt into one file named all.txt?
A.	opy a: *.txt
B.	opy *.txt a:
C.	opy *.txt c:
D.	opy *.txt all.txt
Answer» E.

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