What is the purpose of a file extension?

Question

a. It lets an OS know where to look for a file.

b. It lets an OS know which software interacts with a file.

c. It lets an OS know how big a file is.

d. It lets an OS know which files are safe to delete.

Answer 1

The correct answer is:

b. It lets an OS know which software interacts with a file.

File extensions indicate the type of file and inform the operating system about the appropriate software or application that can open or manage the file.