When asked to factor the trinomial x2 - 18x + 81, a student gives the answer (x - 9) (x + 9). Which of the following statements is true?
A. The answer is incorrect; the trinomial cannot be factored.
B. The answer is incorrect; the minus sign should be a plus sign.
C. The answer is incorrect; the plus sign should be a minus sign.
D. The answer is correct.
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