13. Select True or False:

(a) Queuing theory is mainly concerned with processes having random arrivals.

(b) An infinite population in queues represents the limited size customer pool corresponds to the service and form a line.

(c) In single channel and single phase system, there is one server and one phase of service for giving facilities to the customers.

(d) The multiple-server queuing model is similar to the single-server model, but the only exception is that the number of serves is limited to one.

(e) In limited population queuing model, the main feature is limited space for waiting.