Complete and balance the followig equations in basic solution :
`Hg_2(CN)_2+Ce^(4+)toCO_3^(2-)+NO_3^(ɵ)+Hg(OH)_2+Ce^(3+)`
(a) By considering C in `+4` oxidation state and N in `+5` oxidation state.
(b) By considering C in `+4` oxidation state and N in `+5` oxidation state
(c) By considering Hg in `+2` and C in `+4` oxidation state.
(d) Explain why the same result is obtained regardless of the choice of oxidation state.