♪ >> dana: greg is going for his driver's license test tomorrow and he has the written portion. we thought we would help him study by testing our own driving knowledge. it is quiz time. so it's multiple-choice. hold up. i have the answer. which of the following must you obey over the other three. a, a steady red light. b, policeman. c, stop sign. d, flashing red light. >> juan: the policeman was what? >> dana: b. we are all going to say b. maybe these will get harder as we go on. the answer is b.