Your audience can be anybody, children, adults, or any specific group of people. The audience is your reader.
Yes Do they give any multiple chose answers
I would say that musicians benefit the most because it makes a difference in whether they have a full copyright, all rights, public domain, or even no rights of their music. This would also pertain to the film industry as well.
I believe c is the answer because when ever you read you always have to have a perspective on what you have written