During an iteration of the Drop heuristic, the net savings associated with dropping one of four facilities is given below. Which facility should be dropped? Facility 2 Facility 4 Facility 8 . Facility 5 Replenishment lead time for a firm's product is 1 week. If the firm switches to another vendor that has a 9 week lead time, what will be the impact on the firm's safety stock? ROP= 3 times higher No impact 9 times higher None of the above