Correct Answer:
A. 123
Lotus 1-2-3 used several different file extensions throughout its development. 1 While .123 is a recognized extension for later versions, the software also famously utilized extensions like .WKS (for early versions), .WK1, .WK3, and .WK4. Among the options provided, ".123" is the only one associated with Lotus 1-2-3, as ".DOC" is for Microsoft Word, ".XLS" is for Microsoft Excel, and ".PPT" is for Microsoft PowerPoint.
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