Refer to the association marked with the number 7 in the preceding diagram. Assume that customers pay for all sales during the month in full at the end of the month. Which of the following is the best example of a business rule that constrains the association?
a. Customers are allowed to pay for sales on credit.
b. Customers must pay for sales at the time of the sale.
c. Customers are prohibited from paying for sales on credit.
d. Customers may delay payment for a sale upon approval by the manager.
e. None of these are an example of an appropriate business rule for the association.

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Inventory Cash 1..* 1..1 5 6 O..* O..* Sales 7 ?..? ?..? Cash Receipts 0..* O..* 3 O..* O..* 1 1..1 2 1..1 4 1..1 Employees Customers 1..1