In one clinic the patient visit involved four distinct steps and each step involved only 1 resource, and each resource worked on only one step. One day a new resource replaced an older, faster one. This caused the time needed for one of the steps to double. As a result the capacity of the system decreased but it did not drop by half. Which of the following statements present the most reasonable explanation? Group of answer choices This would not be a problem if arrival rates were variable There were multiple bottlenecks to begin with Another step became the bottleneck after the machine was dropped This step had excess capacity to begin with None of the above