A service counter employs two servers. On average a server requires $8$ minutes to process a customer and service times has a coefficient of variation of $1($CV $1$ Customers arrive at the counter at the rate of $12$ per hour on average with a coefficient of variation of $1($CV $1)$

Select one:

The average number of customers waiting to be served would be

a$.2\mathrm{.}844$

b$.4\mathrm{.}444$

c$.0\mathrm{.}893$

d$.1\mathrm{.}600$