What does the cover of twilight mean?

This is Stephenie Meyer's explanation straight from her website ( stepheniemeyer.com )The Apple on the cover of Twilight represents "forbidden fruit." I used the scripture from Genesis (located just after the table of contents) because I loved the phrase "the fruit of the knowledge of good and evil." Isn't this exactly what Bella ends up with? A working knowledge of what good is, and what evil is. The nice thing about the Apple is it has so many symbolic roots. You've got the Apple in Snow White, one bite and you're frozen forever in a state of not-quite-death... Then you have Paris and the golden Apple in Greek mythology-look how much trouble that started. Apples are quite the versatile fruit. In the end, I love the beautiful simplicity of the picture. To me it says: choice.Also, keep in mind that in the movie when Bella and Edward were in the cafateria Bella... being clumsy as usual, dropped an Apple. But guess who was to the rescue? Edward ofcourse. The Apple pops off the tip of his shoe into his hands as he holds it with care in his two hands. A short but Meaningful moment in the movie.