The figure shows the variation of photocurrent with anode potential for a photo-sensitive surfac...

The figure shows the variation of photocurrent with anode potential for a photo-sensitive surface for three different radiations. Let \( I_{a}, I_{b} \) and \( I_{c} \) be the intensities and \( f_{a}, f_{b} \) and \( f_{c} \) be the frequencies for the curves \( a, b \) and \( c \) respectively
(A) \( f_{a}=f_{b} \) and \( l_{a} \neq l_{b} \)
(B) \( f_{a}=f_{c} \) and \( l_{a}=l_{c} \)
(C) \( f_{a}=f_{b} \) and \( l_{a}=l_{b} \)
(D) 1) \( f_{a}=f_{b} \) and \( l_{a}=l_{b} \)