Given that $E^{\large\circ}_{Fe^{3+}|Fe}$ and $E^{\large\circ}_{Fe^{2+}|Fe}$ are -0.36V and -0.439V,respectively.The value of $E^{\large\circ}_{Fe^{3+},Fe^{2+}|Pt}$ would be

Question

$\begin{array}{1 1}(-0.36-0.439)V\\(-0.36+0.439)V\\(3(-0.36)+2(-0.439))V\\(3(-0.36)-2(-0.439))V\end{array}$