Using the fixed$-$time$-$period inventory model, and given an average daily demand of $200$ units, $4$ days between inventory reviews, $5$ days for lead time, $120$ units of inventory on hand, a $z$ of $1\mathrm{.}96,$ and a standard deviation of demand over the review and lead time of $3$ units, which of the following is the order quantity?

Multiple Choice

About $1,806$

About $2,206$

About $1,086$

About $1,686$

About $2,686$