In photoelectric effect, the stopping potential $\left(\mathrm{V}_0\right) \mathrm{v} / \mathrm{s}$ frequency $(v)$ curve is plotted. ( h is the Planck's constant and $\phi_0$ is work function of metal ) (A) $\mathrm{V}_0 \mathrm{v} / \mathrm{s} v$ is linear. (B) The slope of $\mathrm{V}_0 \mathrm{v} / \mathrm{s} v$ curve $=\frac{\phi_0}{\mathrm{~h}}$(C) h constant is related to the slope of $\mathrm{V}_0 \mathrm{v} / \mathrm{s} v$ line. (D) The value of electric charge of electron is not required to determine h using the $\mathrm{V}_0 \mathrm{v} / \mathrm{s} v$ curve. (E) The work function can be estimated without knowing the value of $h$. Choose the correct answer from the options given below :