Jobs A, B, and C are in queue at work center 10 before being completed on work center 20. The following information pertains to the jobs and the work centers: (Job, Process time (day) at WC 10, process time (day) at WC 20, Due Date): (A, 8, 6, 24); (B, 6, 4, 20); and (C, 5, 2, 22). For this problem, there is no move time between two centers. Today is day 1. If the jobs are scheduled by Johnson's rule today, how many idle days from day 1 to the day end (the date that last job is completed) in work center 20 will have?

A 8

B 9

C10

D 11

E NONE OF THEM