[ 4 pts. ] An emergency unit is to be placed in a facility consisting of four manufacturing cells in which most of the accidents occur, are located at the coordinates: (1.50, 4.31), (1.00, 6.49), (0.94, 6.60), and (8.04 9.27). Which one of the following value is closest to the optimal objective value (optimal maximum distance) of the above facility location problem in order to minimize the maximum of orthogonal distances between the manufacturing cells and the emergency unit? Select one: O a. 8.20 O b. 2.31 O c. 4.39 O d. 5.75