The fig. shows the variation of photon current with anode potential for a photo-sensitive surface for three different radiation. Let `I_(a), I_(b) and I_(c)` be the intensities and `f_(a), f_(b) and f_(c)` be the frequency for the curves a,b and c respectively.

Options

A. `f_(a)=f_(b)` and `f_(a)cancel=I_(b)`
B. `f_(a)=f_(c)` and `I_(a)=I_(c)`
C. `f_(a)=f_(b)` nd `I_(a)=I_(b)`
D. `f_(a)=f_(b)` and `I_(a)=I_(c)`