Question: Which of the following statements is valid? a. SELECT title FROM books WHERE retail < (SELECT cost FROM books WHERE isbn = '9959789321'); b. SELECT

Which of the following statements is valid?
a. SELECT title FROM books

WHERE retail < (SELECT cost FROM books
WHERE isbn = '9959789321');

b. SELECT title FROM books

WHERE retail = (SELECT cost FROM books
WHERE isbn = '9959789321' ORDER BY cost);

c. SELECT title FROM books

WHERE category IN (SELECT cost FROM orderitems
WHERE isbn = '9959789321');

d. None of the above statements

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