Which of the following sets are closed under scalar multiplication?

(i) The set of all vectors inR2of the form (a,b) wherea 5b= 0.

(ii) The set of all 22 matrices whose trace is equal to 4.

(iii) The set of all polynomials inP₂of the forma₀+a₁x+a₂x2where the producta₀a₁a₂ 0.

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