Taylor manages a database for a regional hardware enterprise with 10 stores in 2 states. The hardware store wholesales to contractors. The database includes these tables (among others): tblContractor, tblProducts, tblBilling, tblInvoices.
Taylor has added the tables tblContractor, tblBilling, and tblInvoices to the relationships window. He has created a relationship between the tblBilling and tblContractor based on the ContractorID field. What type of relationship is this?