4. Cost Classification a. Classify the manufacturing costs, marketing costs, and customer service hotline costs either as production costs or period costs. All manufacturing costs are costs. All marketing costs and customer hotline costs are b. For the period costs, further classify them into either selling expenses or general and administrative expenses. costs Marketing costs are selling oriented; therefore, the marketing period costs would be further classified as hotline costs relate to the customer service section of the value chain and would be further classified as . Customer