Two Systems Are Used in Accounting for Inventory-Perpetual and Periodic

Two systems are used in accounting for inventory-perpetual and periodic. Which of the following statements is correct?

A) In a perpetual inventory system, the inventory account is not changed for each purchase during the accounting period.
B) In a perpetual inventory system, cost of goods sold is recorded at the time of each sale during the accounting period.
C) In a periodic inventory system, cost of goods sold is developed from a comparison of beginning inventory and ending inventory only.
D) In a periodic inventory system, the inventory account is increased for each purchase during the accounting period.