What relationship pattern is illustrated in the following sc…

What relationship pattern is illustrated in the following schema? PRODUCT (ProductID, Description) SUPPLIER (SupplierID, ContactName, PhoneNumber) PRODUCT_SUPPLIER (ProductID, SupplierID, Cost) ProductID in PRODUCT_SUPPLIER must exist in ProductID in PRODUCT SupplierID in PRODUCT_SUPPLIER must exist in SupplierID in PRODUCT