Shoprite at Melville has a single line for customers waiting for the next available cashier. There are three cashiers who work at the same rate. The arrival rate of shoppers follows a Poisson distribution, while the service time follows an exponential distribution. The average arrival rate is five per minute and the average service rate is two per minute for each of the three cashiers. How long does the average shopper spend waiting for a cashier in a queue? A) 3.51 minutes B) 0.70 minutes C) 1.20 minutes D) 0.83 minute E) 0.5minutes

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