Which statement BEST summarizes research on test delivery? a. Students who used pencil-and-paper tests outperformed those who used handheld computers. b. Students who used paper-and-pencil tests outperformed those who used notebook computers. c. Students who used any type of computer outscored those who used paper-and-pencil tests. There are no meaningful differences between students who take their tests using a computer and those who take it using pencil and paper