Which of the Following Statements Is NOT Correct

Which of the following statements is NOT correct?

A) In a perpetual inventory system, the "cash register" at the store is a computer terminal that records sales and updates inventory records.
B) Even in a perpetual inventory system, a business must count inventory at least one a year.
C) Restaurants and small retail stores often use the periodic inventory system.
D) In a periodic inventory system, merchandise inventory and purchasing systems are integrated with the records for Accounts Receivable and Sales Revenue.