The rate at which electrical energy is used by the Ortiz family in one day, in kilowatt-hours (KW-h) per hour, is given by K(t) = 12te 8 - where t is time, in hours. That is, t is in the interval [0,24]. K(t) = 12te-t 6- a) How many kilowatt-hours does the family use in the first T hours 4- of a day (t = 0 to t = T)? b) How many kilowatt-hours does the family use in the first 4 hours 2- of the day? 4 CO- 10 .. . a) How many kilowatt-hours does the family use in the first T hours of a day (t = 0 to t = T)? Choose the correct expression below. O A. 6The-T + 6The-T - 12 O B. - 12Te- + 12e- + 12 O C. - 12Te T + 12e-T -12 O D. - 12e- T O E. - 12Te- - 12e-+ 12 OF. 6The- T + 12Te- T