In process-oriented layouts, the objective is to minimize the handling costs. Total cost formula is: n n cost=.C, i=1 j=1 , where Cj refers to cost to move a unit load between department i and department j. What does X, refer to? distance between department i and department j O total cost of handling between department i and department j Ototal number of work centers or departments number of loads moved from department i to department j