Refer to the Three-Step Line with Batch Processing Diagram. At what batch size are two steps both in bottlenecks? Three-Step Line with Batch Processing Diagram Consider the following three-step process with setup times and task times: Each step employs a single worker who is not cross-trained for any other step. The setup represents the amount of time each separate worker spends setting up the machine for each order. No units can be processed on a machine while it is being set up. The runtime represents the amount of time it takes the worker to process a single unit. Note that there is a separate worker at each step, and workers can work concurrently. Select one: a. 7 units b. None c. 5 units d. 6 units