(1 pt) Which of the following subsets of P2 are subspaces of P2? (Select all correct answers.) A. {p(x) | p(7) = 4} B. {p(x) | p(x) = p(x) for all x} C. {p(x) | p'(3) = p(6)} D. {p(x)|p'(x)+2p(x) + 3 = 0 for all x} E. {p(x) | p(0) = p(7)} = | = 9} F. {p(x) | [* P(x)dx G. {p(x)|p'(x)+4p(x) = 0 for all x} Be sure you know how to show the work to justify your answers.