In queuing theory, the nature of the waiting situation can be studied and analysed mathematically if_________________?

A. arrival and waiting times are known and can be grouped to form a waiting line model

B. complete detailsof items in, waiting line are known

C. all of the above

D. all variables and constants are known and form a linear equation

E. the laws governing arrivals, service times, and the order in which the arriving units are taken into source are known

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