For question A, the options go from 1-6

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80 90 Dan's Auto Detailing business performs two major activities: exterior cleanup and interior detailing. Based on the size of the car and its condition, time estimates for six cars on Monday morning are as follows: Car Number 1 2 3 4 5 6 Exterior 75 65 25 80 Interior 50 60 55 a. Sequence the cars so that all exterior cleanup is done first and total completion time is minimized. The sequence using Johnson's rule is -Select- -Select- -Select- -Select- - -Select ---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 -Select- 40 35 45 A. Exterior 26 90 166 245 325 Time 0 415 + 4 1 2 2 3 H 6 Job Interior Time 25 166 245 325 90 36 415 0 136 216 205 366 450 |-+ -H H-- -H Job 6 4 1 2 3 B. Exterior 90 236 170 310 Time 0 390 415 3 2 1 6 6 Job Interior Time 90 170 236 310 390 125 466 445 210 200 360 525 |-- + -H H--+ H---H H-H H--H Job 3 4 1 6 6 6 C. 105 100 245 325 415 6 1 2 3 Exterior Time 0 25 H Job 6 Interior Time 26 0 --+ Job 105 100 325 245 230 415 06 160 290 365 450 H--1 H--H H-1 + LD 6 1 4 2 3 D. Exterior Time 0 75 166 245 310 336 415 + H 3 4 6 6 Job Interior Time |-- Job 76 155 245 310 375 436 0 126 195 200 356 416 490 -- + H---H t- - + -H H--H--H 1 2 3 4 6 6 Evaluate the idle time. Round your answer to the nearest whole number. minutes