3. A centralized service is modeled as the simple queueing system shown in the figure below. Requests Response Queue Process A: If the service receives 20 requests per second, but the processing capacity is 25 requests per second, what are the utilization, the average number of requests in the system, and the response time? B: Scalability issues emerge when utilization approaches 1 and response-to-server time quickly increases to very high values. Discuss some practical ways in which the service time may be decreased