$1)$ The time spent in a line or queue is a function of all of the following, except

A$.$ the queue configuration and discipline

B$.$ the waiting costs

C$.$ the rate at which the flow units are processed or served

D$.$ the rate at which the flow units enter the system

$2)$ Emergency departments commonly use which one of the following queue

disciplines?

A$.$ FCFS

B$.$ Reservation first

C$.$ Priority system $($Emergency first$)$

D$.$ SPT