The standard reduction potential of $Ag^+/Ag$ electrode at 298K is 0.79V.$K_{sp}$ of Ag$^+$ is $8.7\times 10^{-17}$.Evaluate the standard reduction potential of $I^-/AgI/Ag$ electrode

Question

$\begin{array}{1 1}(a)\;-0.149V\\(b)\;-0.37V\\(c)\;-0.26V\\(d)\;-0.4V\end{array}$