Using the fixed$-$time period inventory model, and given annual demand of $73,000$ units, $4$ days between inventory reviews, $5$ days for lead time, $120$ units of inventory on hand, a $97\mathrm{.}5\%$ service level, and a standard deviation of demand of $1$ unit. Assuming $365$ days$/$year$,$ which of the following is the order quantity?

$$ About $1\mathrm{.}086$

Aoout $1\mathrm{.}686$

About $1,806$

$$ About $2,206$

About $2,686$