The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement ?

1. A. Curves (b) and (c) represent incident radiations same frequencies having same intensity.
2. B. Curves (a) and (b) represent incident radiations of different frequencies and different intensities
3. C. Curves (a) and (b) represent incident radiations of same frequencies but of different intensities
4. D. Curves (b) and (c) represent incident radiations of different frequencies and different intensities

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