Which of the following statements is true? (You may select more than one answer.)

a. Indirect materials and indirect labor are included in manufacturing overhead.

b. Examples of selling costs include sales commissions, advertising, shipping, and the costs of operating finished goods warehouses.

c. For financial accounting purposes, product costs include direct materials, direct labor, and manufacturing overhead.

d. For financial accounting purposes, period costs are also referred to as inventoriable costs.