A customer may make many purchases or no purchases. A purchase order may have one and only one customer.

Which of the following is the best way to implement that association in your database?

		Post the primary key of Purchase Order as a foreign key in the Customers table.
		Create a class for Sales Person between the two classes as a go-between
		Create a linking table
		Post the primary key of Customers as a foreign key in the Purchase Order table.
		None of the listed answers