Question 9 2 pts Trains arrive to a maintenance process and wait in a single buffer until a service team is available. When a service team becomes available, it runs the necessary diagnostics on the next train waiting in the buffer. There are currently 3 service teams, and each service team has a 90% utilization. The manager is afraid that the service teams will burn out if they work too much. The manager would prefer to reduce the utilization to be at most 75%. The manager cannot control the input rate of trains. However, the manager can hire additional service teams to create a larger resource pool. What is the fewest number of service teams that the manager needs to hire to guarantee that the utilization of each service team is at most 75%? Note: Your answer should be an integer.