In a coffee shop, two separate lines form, one line for each of the $2$ baristas. The average arrival rate for each server is $11$ customers$/$hr$,$ while the average service rate $-13$ customers$/$per hr$/$per server.What would be the average # customers in line if they switch to a single pooled line that uses all the baristas simultaneously? $($Use Table, if desired $-$ pick the closest answer $-$ decimals allowed$).$O a$.4\mathrm{.}82$ b$.4\mathrm{.}13.4\mathrm{.}43$ d$.3\mathrm{.}89$