How should unallocated fixed overhead costs be treated?
a. Allocated to finished goods and cost of goods sold based on ending balances in the accounts.
b. Allocated to raw materials, work in process, and finished goods, based on the ending balances in the accounts.
c. Recognized as an expense in the period in which they are incurred.
d. Allocated to work in process, finished goods, and cost of goods sold based on ending balances in the accounts.