Which of the following statements is correct?

A.

Product costs for a merchandiser are expensed as selling, general, and administrative expensed when the related unit is sold.

B.

Period costs are relevant for purposes of calculating Gross Profit on the Income Statement for a both a merchandiser and a manufacturer.

C.

All links in the value chain applicable to a service company are considered period costs.

D.

Product costs for a merchandiser are categorized as either direct material, direct labor, or manufacturing overhead costs.

E.

Costs incurred in the production link in the value chain for a manufacturer are expensed when incurred.