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

CREATE VIEW changename

AS SELECT customer#, lastname, firstname

FROM customers

WITH CHECK OPTION;

Assume that the only constraint on the CUSTOMERS table is a PRIMARY KEY constraint.

Which of the following DML operations could never be used on the CHANGENAME view?

a. INSERT

b. UPDATE

c. DELETE

d. All of the above are valid DML operations for the CHANGENAME view.