Which of the following experiments uses independent samples?

You want to compare the mean SAT score of students who take a new SAT preparation course to that of students who don’t take an SAT preparation course. So you compare the mean SAT score of a randomly selected group of students who took a new SAT preparation course to the mean SAT score of a randomly selected group of students who didn’t take an SAT preparation course.
You want to compare the mean SAT score of a randomly selected group of students who took a new SAT preparation course to the national average SAT score.
You want to compare the depression levels of teenage girls before and after attending a weeklong camp focused on improving self-image. So you compare the mean Hamilton depression scores of a randomly selected group of teenage girls before and after they attend a weeklong camp focused on improving self-image.