MAH company uses process costing.MAH calculates unit costs under the weighted-average process-costing method, the unit cost is based on:

a.

only the current period's manufacturing costs.

b.

only costs in the period's beginning work-in-process inventory.

c.

a summation of the costs in the beginning work-in-process inventory plus costs incurred in the current period.

d.

only costs incurred in previous accounting periods.

e.

a summation of the costs in the beginning work-in-process inventory plus costs to be incurred in the upcoming period.