Disk Operating System (DOS) Interview Question:

Which of the following extensions suggest that the file is a backup copy?

a. Bak
b. Bas
c. Com
d. Txt

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a. Bak
Explanation:
Bak extension is commonly used to store backup copies of files so that it can be restored later when original file is corrupted or deleted. Bas extension indicates the file is a BASIC program source file, com is command file and txt is plain text file.
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