Consider the process flow diagrams for Process A and Process B below. Both of them are empty and they start processing units at 8 a.m. How many units are in each system at 9 a.m.? START Station 1 Station 2 Station 3 END 10 min/unit 30 min/unit 20 min/unit Process A START Station 1 Station 2 Station 3 END 10 min/unit 30 min/unit 20 min/unit Process B O Process A: 3 units; Process B: 6 units O Process A: 10 units; Process B: 12 units O Process A: 6 units; Process B: 10 units O Process A: 4 units; Process B: 6 units