Consider the Mimimize Total completion Time (Makespan) modd one job can ke processed on both resources A and B at anytine (t), i.e. bst=1. The resources and duration of the individual process steps are given in The following table: Explain whether the following solutions are permissible and whether they are optimal. (All xjst decision variables pot explicitly specifed have the value 0 .) (a) x1,1,3=x1,2,5=x2,1,7=x2,2,9=x3,1,3=x3,2,10=1 (b) x1,1,3=x1,2,7=x2,1,7=x2,2,9=x3,1,3=x3,2,10=1 (c) x1,1,3=x1,2,5=x2,1,7=x2,2,7=x3,1,3=x3,2,10=15 (d) x1,1,3=x1,2,5x2,1,7=x2,2,9=x3,13=x3,2,12=1