A single-server queue with infinite buffer space has been established. Two different scenarios are described below: 1. The inter-arrival time of customers to the server is constant at a value of 1 second. Additionally, the service time required by each customer is constant at a value of 0.5 seconds. 2. The inter-arrival time of customers to the server is exponentially distributed with a mean of 1 second. Additionally, the service time required by each customer is exponentially distributed with a mean of 0.5 seconds. Explain why the expected waiting time for a customer is 0 seconds for the first scenario. Determine the expected waiting time for a customer for the second scenario. Why is the expected waiting time for these two scenarios different when they have the same mean inter-arrival and service times?