Audrey examines students' learning of science principles from interactive games. She randomly assigns the fifth grade students in her study to a control condition with no play time, a timed play condition, or an unlimited time play condition. She also groups her students into either high or low ability groups. She measures her students with a knowledge pretest, a post-test, and a delayed post-test. Which of the following best represents Audrey's study design?
◦ A 3 × 3 factorial design
◦ A 3 × 2 factorial design
◦ Pretest-posttest control group design
◦ A 3 × 2 × 3 factorial design