/hich of the following subsets of P2 are subspaces of P2? A. {p(t) | So p(t)dt = 0} B. {p(t) | p'(t) + 9p(t) +3 = 0} C. {p(t) | p(0) = 7} D. {p(t) | p'(t) is constant } DE. {p(t) | p'(2) = p(1)} F. {p(t) | p(4) = 0} %3D

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