Write the oxidation and reduction half$-$reaction equations for the following reaox reactions: $/$I

$($a$)S{n}^{2+}(aq)+Co(s)Sn(s)+C{o}^{2+}(aq)$

$($b$)2A{g}^{+}(aq)+Pb(s)2Ag(s)+P{b}^{2+}(aq)$

$($c$)2F{e}^{2+}(aq)+I_2(s)2I^{-}(aq)+2F{e}^{3+}(aq)$