Refer to the association marked with the number 3 in the preceding diagram. Which of the following is the best description of the association?
a. Each sale is associated with a minimum of one customer.
b. Each sale may involve multiple customers.
c. Each sale is associated with a maximum of many customers.
d. Each sale may involve no customers.
e. None of these are a description of 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