For a fuel cell, which statement is correct?

What is the standard potential of the ${\mathrm{Tl}}^{3+}/\mathrm{Tl}$ electrode ?

${\mathrm{Tl}}^{3+}+2{\mathrm{e}}^{-}\to {\mathrm{Tl}}^{+},{\mathrm{E}}^0=1.26\mathrm{V}$

${\mathrm{Tl}}^{+}+{\mathrm{e}}^{-}\to \mathrm{Tl}, {\mathrm{E}}^0=-0.336\mathrm{V}$

$2\mathrm{Ag}+2{\mathrm{H}}^{+}\to {\mathrm{H}}_2+2{\mathrm{Ag}}^{+}$ ${\mathrm{E}}^{\circ }$ for ${\mathrm{Ag}}^{+}+{\mathrm{e}}^{-}\to \mathrm{Ag}$ is $0.80 \mathrm{V}$.

The $\mathrm{E}°$ values of the following half cells are given: $\left(25 {}^{\circ }\mathrm{C}\right)$

${\mathrm{Fe}}^{3+}\left(\mathrm{aq}\right)+{\mathrm{e}}^{-}\to {\mathrm{Fe}}^{2+}\left(\mathrm{aq}\right)+\stackrel{\mathrm{E}°}{0.771 \mathrm{V}}$

${\mathrm{Fe}}^{2+}\left(\mathrm{aq}\right)+2{\mathrm{e}}^{-}\to \mathrm{Fe}\left(\mathrm{s}\right)-0.44 \mathrm{V}$

The $\mathrm{\Delta G}°$ of ${\mathrm{Fe}}^{3+}\left(\mathrm{aq}\right)+3{\mathrm{e}}^{-}\to \mathrm{Fe}\left(\mathrm{s}\right)$

Will be, $\left(\mathrm{F}=96485 \mathrm{C} {\mathrm{mol}}^{-1}\right)$