Taylor Manages a Database for a Regional Hardware Enterprise with 10

Multiple Choice

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 wants to create a query that shows all contractors and identifies invoices assigned to those contractors.However,he also wants to see contractors who might not have an invoice assigned for this billing period.What type of join between tables will give Taylor the desired results?

A) inner join
B) outer join
C) self-join
D) many-to-many