While working with MS-DOS which command is used to change the extension of all filenames ending with .txt to .doc?
a. Ren *.doc *.txt
b. Ren *.txt *.doc
c. Ren file.doc file.txt
d. Ren a: *.doc *.txt
Submitted by: Administratorb. Ren *.txt *.doc
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Submitted by:
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