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View the Exhibit and examine the ORDERS table.

The ORDERS table contains data and all
orders have been assigned a customer ID.

Which statement would add a NOT NULL constraint to the CUSTOMER_ID column?

A.
ALTER TABLE orders
ADD CONSTRAINT orders_cust_id_nn NOT NULL (customer_id);

B.
ALTER TABLE orders
MODIFY customer_id CONSTRAINT orders_cust_id_nn NOT NULL;

C.
ALTER TABLE orders
MODIFY CONSTRAINT orders_cust_id_nn NOT NULL (customer_id);

D.
ALTER TABLE orders
ADD customer_id NUMBER(6)CONSTRAINT orders_cust_id_nn NOT NULL;

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