This question is based on successful execution of the following statement:

CREATE VIEW changeaddress

AS SELECT customer#, lastname, firstname, order#,

shipstreet, shipcity, shipstate, shipzip

FROM customers JOIN orders USING (customer#)

WHERE shipdate IS NULL

WITH CHECK OPTION;

Which of the following is the key-preserved table for the CHANGEADDRESS view?

a. CUSTOMERS table

b. ORDERS table

c. Both tables together serve as a composite key-preserved table.

d. None of the above