9. Given the true statement: "If you did not forget your pencil, then you will not borrow one of mine." Which statement must also be true?
(1 Point)
1.If you forget your pencil, then you will borrow one of mine.
2. If you borrow one of my pencils, then you did not forget your pencil.
3.If you didn't borrow one of my pencils, then you forgot your pencil.
4. If you borrow one of my pencils, then you forgot your pencil