In a photoelectric effect experiment, monochromatic light shines on a metal target with threshold frequency \(f_0\). An accelerating potential difference is maintained across the apparatus so that all emitted electrons are collected, producing a photocurrent \(I\). The light intensity \(I_{\text{light}}\), defined as radiant energy per unit area per unit time, is varied for three light sources: Source 1 with frequency \(f_1 > f_0\), Source 2 with frequency \(f_2 > f_1\), and Source 3 with frequency \(f_3 < f_0\). Which of the following graphs best represents the photocurrent \(I\) as a function of light intensity \(I_{\text{light}}\) for the three sources?