Jeff, who is living alone for the first time, is something of a germaphobe, so when a lot of his classmates come down with colds and the flu, he decides to buy a thermometer and start monitoring his own temperature. One afternoon he finds his temperature is 99F. Should he be worried? Select one: a. Yes, his temperature is abnormally low and could quickly become dangerous. b. Probably not at this point. He does have a slightly elevated temperature, but it is not at a dangerous level. c. Probably yes, because his temperature has reached the point where it is doing more harm than good. d. Absolutely, his temperature is at a life-threatening point and he should seek emergency assistance