Consider the following 4 step assembly operation with quality problems. All resources are staffed by one employee. Processing times are: first resource-5 minutes/unit; second resource-6 minutes/unit; third resource-3 minutes/unit but a 30% probability the flow unit coming out of the third resource has to be reworked. In that case, the operations at the first, second and third resources are repeated. Assume rework always corrects the problem, and processing times for rework are the same as for regular units. The fourth resource has a processing time of 4 minutes. Where in the operation is the bottleneck? What is the capacity of the process?