Which of the Following Statements Regarding a Periodic Inventory System

Which of the following statements regarding a periodic inventory system is incorrect?

A) A periodic inventory system is simpler than a perpetual inventory system.
B) A periodic inventory system works well for small businesses in which inventory costs can be controlled by visual inspection.
C) The only way to determine the ending merchandise inventory and cost of goods sold in a periodic inventory system is to take a physical inventory.
D) The various inventory costing methods are not used in a periodic inventory system.