Dan's Auto Detailing business performs two major activities: exterior cleanup and interior detailing. Based on the size of car and condition, time estimates for six cars on Monday morning are as shown in the accompanying table. Car Number 1 2 3 4 5 6 Exterior 90 80 20 65 55 75 Interior 35 40 35 50 60 45 a. Sequence the cars so that all exterior cleanup is done first and total completion time is minimized. The sequence is -Select- -Select- -Select- -Select- -Select- v -Select- b. Choose the correct Gantt chart with the minimum makespan schedule. (Note: Dash single lines represent idle times and solid lines represent job processing times.) The correct graph is graph C VA. Exterior Time 0 170 190 256 310 305 Job 2 3 6 6 Interior Time 170 220 265 310 305 126 210 245 306 370 430 H Job 2 5 B. Exterior Time 0 20 75 140 215 295 305 Job 3 6 S 2 Interior Time 20 78 150 215 205 136 395 56 200 260 335 430 Job 5 C. Exterior Time 80 170 245 310 365 306 Job 2 6 5 Interior Time 0 170 245 310 365 126 210 425 290 360 4 15 460 H JobExteriOr Ti me o 2:) 75 14-3 :1 s :95 345 Job 3 5 4 e 2 1 Interim - :3 75 140 :15 :95 335 Time 0 as 135 19:) :50 335 42:) Job 3 5 .1 e 2 1 Evaluate the idle time. Round your answer to the nearest whole number. minutes