Candy Incorporated stocks bubble gum game cards, an item that has a normally distributed demand during the reorder period with a mean of $12$ dozen boxes and a standard deviation of $2$ dozen boxes. If it is desirable to experience a stockout only $10$ percent of the time, what is the appropriate safety stock?

$2\mathrm{.}56$

$1\mathrm{.}28$

$90$

$10$

none of the above