$AgNO_3(aq)\;\overset{\overset{electrolysis}{\Large\rightarrow}}{in\;presence\;of\;pt\;electrode}$ then at end of electrolysis

Question

$\begin{array}{1 1}(a)\;P^H\uparrow\\(b)\;P^H\downarrow\\(c)\;P^H\;constant\\(d)\;None\end{array}$