What does the following SQL query accomplish?

SELECT Customer$\_$T$.$CustomerID, Order$\_$T$.$CustomerID, CustomerName, OrderID

FROM Customer$\_$T INNER JOIN Order$\_$T ON Customer$\_$T$.$CustomerID $=$ Order$\_$T$.$CustomerID ORDER BY OrderID;

Lists all customers and orders, including those without matches

Lists all customers with their respective orders only if there are matches

Lists only customers without orders

Lists orders without customer information