A voltaic cell is made by connecting zinc and lead half-cells. The overall equation for the reaction occurring in the cell is shown below.

\[{\text{Zn(s)}} + {\text{P}}{{\text{b}}^{2 + }}{\text{(aq)}} \to {\text{Pb(s)}} + {\text{Z}}{{\text{n}}^{2 + }}{\text{(aq)}}\]

Which statements are correct when the cell produces electricity?

I.     The zinc is oxidized.

II.     Electrons move from zinc to lead in the external circuit.

III.     The mass of the lead electrode increases.

A.     I and II only

B.     I and III only

C.     II and III only

D.     I, II and III

D