Which of the following is not a valid SELECT statement?a. SELECT STDDEV(retail)FROM books;b. SELECT AVG(SUM(retail))FROM ordersNATURAL JOIN orderitems NATURAL JOIN booksGROUP BY customer#;c. SELECT order#, TO_CHAR(SUM(retail), '999.99')FROM orderitems JOIN books USING(isbn)GROUP BY order#;d. SELECT title, VARIANCE(retail-cost)FROM booksGROUP BY pubid;

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