Product costs include:

a$.$ direct materials, direct labor, and manufacturing overhead.

b$.$ selling and administrative expenses.

c$.$ the cost that does not change in total as output changes.

d$.$ the cost associated with storing and delivering the product.

Which of the following is true of direct materials cost?

a$.$ It is a part of the final product and can be directly traced to the goods being produced.

b$.$ It is a part of manufacturing overhead and cannot be traced to the cost object of interest.

c$.$ It is a period cost for running a company that is not carried in the inventory.

d$.$ It is a cost that cannot be assigned to products or appear as part of the reported values of inventories on the balance sheet.