Question

What is the main function of a file extension?

O to allow the file to be extended to new uses
O to indicate which version of the file it is
O to indicate how much space the file takes up
O to indicate which program is needed to open it

Answer 1

Main function of a file extension is to indicate which program is needed to open it.

Step-by-step explanation:

A file extension is added to a file name in last, by writing a dot and then name of an extension suitable for it. For example, an extension used in any text file is .txt. You cannot use .txt extension for any photo.