Which of the following subsets of P2 are subspaces of P2? A. {p(t) | S P(t)dt = 0} B. {p(t) | p(2) = 2} C. {p(t) | p'(t) is constant } D. {p(t) | p(-t) = -p(t) for all t} E. {p(t) | p'(t) + 8p(t) + 9 = 0} F. {p(t) | p'(3) = p(0)}

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