The pairwise exchange method is an improved type algorithm to search for a better layout than a given initial layout that includes the same size departments. The flow matrix between departments and the distance matrix for the initial layout are attached. Each department has the same area/size. The cost of a layout represents material handling cost in terms of total of flow times the distance between departments i and j. What is the cost of the initial (attached) layout? 2 3 4 25 1 2 3 4 Distance Matrix (Initial Layout) 1 2 3 4 1 40 65 105 2 - 25 65 3 40 Flow Matrix 1 2 3 10 8 5 10 10 20 5 10 4 4 Initial Layout (1-2-3-4) OA. 7340 OB. 6970 OC. 6730 OD. 7070 E. 7210