Which of the following statements is true regarding product and period cost?
a. Office salaries expense is a product cost and factory maintenance is a period cost?
b. office rent is a product cost and supervisors salaries expense is a period cots?
c. Factory rent is a product cost and advertising expense is a period cost?
d. Delivery expense is a product cost and inderect materials are a period cost?
e. Sales commissions is a product cost and indirect labor is a period cost?