Please answer A, B, and C and clearly explain.

There are 15 reservation counters in the central railway station. One can book his/her ticket for any train on any day by using any of these reservation counters. Each clerk spends 5 minutes on average for each customer. Average arrivals per hour during three types of activity periods have been calculated and customers have been surveyed to determine how long they are willing to wait during each type of period. Assumption for this queuing system are as follows: Customer arrivals follow Poisson distribution with mean ; Service time has exponential distribution with mean service rate ; Service discipline is FCFS; The calling source has infinite size.; Mean arrival rate at any reservation counter is less than the mean service rate. a) Is the system a multi server system or not? b) Determine how many counters should be kept open during each type of period (peak, normal, low) c) Management decides to modify reservation counters to show if they are busy (with red light on top) or free (green light on top). In this way, management will make a single queue for all counters. For the number of counters to be kept open during each type of period you have found previously, calculate the improvements in customer's average waiting time during each type of period