In Waiting Line Theory, ... The number of channels refers to the number of customer waiting lines in the system. A waiting line cannot be both multiple-channel and multiple-phase. The Greek letter lambda is used to represent the service rate of a waiting line system. All of the above are correct A customer enters a business and has the opportunity to select any one of three lines to receive service. The service is performed by one customer service representative after which the customer leaves the establishment. Which description of this waiting line system is appropriate? Single-channel, single-phase Single-channel, multi-phase Multi-channel, single-phase Multi-channel, multi-phase