Best Buy's monthly demand for an Olympus Digital Camera FX $5500$ is Poisson distributed with a mean of $3$ cameras$/$month$.$ The order quantity is $6$ cameras, holding costs are $$6\mathrm{.}00$ per camera per year, the backorder cost per outage is $$\frac{12\mathrm{.}00}{?}$ unit, and the lead$-$time is $1$ month.

Determine the safety stock.

$0$

$1$

$2$

$3$

$4$

It NOT THE AWNSWR $4$ AND $3$