Which of the following sets of polynomials form a basis forP₂?

(i)p₁= 1 + 3x+ 6x^2,p₂= 5 +x

(ii)p₁= 1,p₂= 1 4x,p₃=x,p₄=x^2

(iii)p₁= 1 +x,p₂= 6x+x^2,p₃= 1 + 7x+x^2

(A)(iii) only(B)(i) and (ii) only(C)(ii) only(D)(ii) and (iii) only(E)(i) only(F)all of them(G)(i) and (iii) only(H)none of them