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The CUSTOMERS table has these columns:
Which statement finds the rows in the CUSTOMERS table that do not have a postal code?（）
A. SELECT customer_id, customer_name FROM customers WHERE postal_code CONTAINS NULL;
B. SELECT customer_id, customer_name FROM customers WHERE postal_code = '________';
C. SELECT customer_id, customer_name FROM customers WHERE postal_code IS NULL;
D. SELECT customer_id, customer_name FROM customers WHERE postal code IS NVL;
E. SELECT customer_id, customer_name FROM customers WHERE postal_code = NULL;
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