A file extension is also known as the file format. The correct option is A, Open file formats may be either free or proprietary.
What is a file format?
A file extension, often known as a file format, is the structure of a file in terms of how the data within the file is arranged on a computer. A file name extension frequently indicates a certain file format as part of a file's name (suffix).
Open formats are also known as free file formats if they are not burdened by any copyrights, patents, trademarks, or other limitations (for example, if they are in the public domain), allowing anybody to use them for any purpose at no monetary cost.
Hence, the correct option is A, Open file formats may be either free or proprietary.
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