What is the main function of a file extension?

Question

(1 point)
Responses

to indicate how much space the file takes up

to indicate how much space the file takes up

to allow the file to be extended to new uses

to allow the file to be extended to new uses

to indicate which version of the file it is

to indicate which version of the file it is

to indicate which program is needed to open it

Answer 1

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