$27.$ In a M$/$M$/2$ system, arriving rate is $4$ per hour, and the service rate is $3$ per hour.

Suppose that the average customers in the waiting queue is $1\mathrm{.}068.$ What are the average

customers in the system?

A$.1\mathrm{.}067$

B$.2\mathrm{.}400$

C$.1\mathrm{.}425$

D$.1\mathrm{.}631$

E$.1\mathrm{.}584$