Anna and John classify their book collection as used or new, hardcover or softcover, and non-fiction or fiction. Let U, the universal set, be the set of all their books, P the set of used books, Q the set of softcover books, and R be the set of fiction books. Describe the following set in words. POR Choose the words that best describe the set. O A. the set of used fiction books O B. the set of all used books except for the softcover books OC. the set of used books O D. the set of all books except for the used fiction books

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