Jobs A,B,C, and D are in queue at work center 10 before being completed on work center 20 . The table below pertains to the jobs and the work centers: (Job, Process time (day) at WC 10, process time (day) at WC 20, Due Date, arriving order). Tndav is dav 1. If the jobs are scheduled by the shortest process time (SPT) rule, the total idle time (total of both WCs) during day 1 through day end (last job finishing date) is: Hint: you need to first determine the job's operation order by SPT rule. Then in each work center, you need to schedule each job's start date and end date on both WCs. 12 11 10 9 None of them