Is an experiment on photo effect, the slope of the cut off voltage versus frequency of incident light is found to be $4.12 \times 10^{-15} Vs$ given $e= 1.6 \times 10^{-19}\;c$ estimate the value of planes constant

Question

$\begin{array}{1 1} 6.592 \times 10^{-34} \;Js \\ 6.592 \times 10^{34}Js \\ 6.592 \times 10^{-34} J/s \\ 6.592 \times 10^{34}J/s \end{array}$