Which of the following subset of P₂ is not a subspace? Select one: O {p(x) = P₂|p" (1)=0} E O {p(x) P₂|p(1) = 0} O {p(x) = P₂ | p'(0) = 2} O None of these O {p(x) = P₂ | p'(1) = 0}