Which of the following statements about costing is/are FALSE?

(i) Production costs (manufacturing costs) include all costs incurred from the purchase of raw materials until the completion of finished goods.

(ii) Non-manufacturing costs include the warehousing cost of raw materials, work-in-progress inventory, and finished goods.

(iii) Non-manufacturing costs are also called period costs because they are expensed in the period they are incurred, rather than being capitalized into inventory.

(iv) All manufacturing costs are classified as direct costs.