An automobile emissions testing center has three inspectors and tests 35 vehicles per hour. what should the service rate be in order to achieve a target utilization of 95 percent? a. more than 1 but less than or equal to 5 vehicles per hour b. more than 5 but less than or equal to 10 vehicles per hour c. more than 10 but less than or equal to 15 vehicles per hour d. more than 15 but less than or equal to 20 vehicles per hour