Answer-A file extension is

Question

A file extension is

A label designated to a file used to distinguish what program opens that file.

B often three characters long, for example, the file myfile.txt has an extension of .txt, which is a text file.

C determined by viewing the file's icon or by reading the file extension.

D metadata about a file; a string used to uniquely identify a file stored on the file system.

E None of these