The term "queue discipline" refers to: Select one: O a. The reason waiting occurs in underutilized systems O b. None of the choices Oc The willingness of customers to wait in line for service O d. Having multiple waiting lines without customers switching from line to line O e. The order in which customers are served The goal of queuing analysis is to minimize: Select one: O a. The sum of customer waiting costs and costs of providing capacity O b. Costs of providing capacity Oc. None of the choices O d. The sum of customer waiting time and service time O e Customer waiting time