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Which of the following filename extensions suggests that the file is a backup copy of another file?
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A
BAK
💡 Explanation:
The .BAK extension is the standard convention for backup files in many operating systems, particularly DOS and Windows. When you save a backup copy, programs often append .BAK to preserve the original. TXT is for text files, COM for executable commands, and BAS for BASIC program source code - none of these indicate backup status.