Answer: A, it's the most professional way or C but I'd choose A
This isn't related to computers and when you look it up all it comes up with a Stars Wars.
The contains criteria filter requires the records displayed to have the specified text string anywhere. Thecontains operator is used to perform case-sensitive matching regardless of location in strings.
The begins with criteria filter on the other hand requires the records displayed to start with the specified text string
It is called the file extension or filename extension. It is a suffix that indicates the file format.