Which statements are correct for the electrolysis of molten lead(II) bromide, \({\text{PbB}}{{\text{r}}_{\text{2}}}{\text{(l)}}\)?

I.     \({\text{P}}{{\text{b}}^{2 + }}\) is reduced at the negative electrode (cathode).

II.     \({\text{B}}{{\text{r}}^ - }\) is oxidized at the positive electrode (anode).

III.     Bubbles of a brown gas are observed at the negative electrode (cathode).

A.     I and II only

B.     I and III only

C.     II and III only

D.     I, II and III

A