Identify the following as either a product cost or a period cost. Select the appropriate product cost category, or select expense. Description: Coconut flakes used in the cookies. Depreciation on the ovens. Insurance on the computers used in the accounting office. Wages for the bakery security guard. Salaries of the bakers who make the cookies. Electricity for the bakery. Heating for the corporate headquarters. Freight for shipping the cookies to customers. Salary of the baking supervisor.