If sit} represents the rate at 1which students are entering a school building thours afterthe doors open at TED am, 1 l f 5mm represents 0.5 1-0.5 then C) the total number of students in the building at 8:31] am. 0 the rate at which students are entering the building at 8:30 am. 0 the average number of students in the building between S and 8:3[1I am. 0 the average rate at 1which students are entering the building between 8:00 and 3:30 am