Department W had $2,880$ units, one$-$third completed at the beginning of the period; $12,200$ units were transferred to Department X from Department W during the period; and $1,600$ units were one$-$half completed at the end of the period. Assume the completion ratios apply to direct materials and conversion costs.The total number of units to be assigned cost on the cost of production report for Department W isa. $15,080$ unitsb. $13,480$ unitsc. $13,800$ unitsd. $12,200$ units