Which of the following statements about the revenue cycle is NOT true? Select the incorrect statement. If multiple statements are incorrect, select only the answer that contains all incorrect answers.

a. In order to approve a credit request, it is required to consider existing sales orders from this customer.

b. It is required to consider information from the "accounts payable data" table in order to validate the sales order.

c. Information from the customer table and the inventory table is required in the sales order entry sub process.

d. Once the products have been shipped, the billing and accounts receivable sub process can be initiated.

e. Statements c and d are NOT true.