In queuing theory, the nature of the waiting situation can be studied and analysed mathematically if_________________?
(A) complete details’of items in, waiting line are known
(B) arrival and waiting times are known and can be grouped to form a waiting line model
(C) all variables and constants are known and form a linear equation
(D) the laws governing arrivals, service times, and the order in which the arriving units are taken into source are known
(E) all of the above
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