Rabbi A requires his 4th-grade students to be completely silent during davening. His students don't enjoy davening, but they get rewarded for davening well. Rabbi B does not give out prizes, but his class sings the words out loud with him, and they enjoy and get pleasure from the davening itself. Rabbi A is ___ motivating his students, and Rabbi B is motivating his students. O intrinsically; extrinsically O intrinsically; intrinsically extrinsically; extrinsically O extrinsically; intrinsically