Given the following data at the drive-through of a bank: Which of the following statements is TRUE assuming that the rest of the day follows a similar pattern? Arrival. Time 8:06 8:10 8:15 8:36 On average there is enough capacity to serve all customers. The average capacity is 10 customers per hour. On average there is not enough capacity to serve all customers. The average arrival rate is 4 customers per hour. Customer 1 2 3 4 Service Time (minutes) 15 20 7 2 What is the key assumption for the single-server queue model? The average arrival rate is greater than the average service rate. The average arrival rate is lower than the average service rate. The average interarrival time is less than the average process time. The flow rate is greater than the capacity.