The figure shows the variation of photo current with anode potential for a photo-sensitive surface for three different radiations. Let $I_{a}, I_{b}$ and $I_c$ be the intensities and $\gamma_{a}, \gamma_{b}$, and $\gamma_{c}$ be the frequencies for the curves a, b and c respectively. Choose the correct statement.

$\gamma_a=\gamma_b ; I_b=I_c$

From the figure $ I_b = I_c , \gamma_a = \gamma_b$