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The cathode of a photoelectric cell is changed such that the work function changes from ${\mathrm{W}}_{1}$ to ${\mathrm{W}}_{2}$ $\left({\mathrm{W}}_{2}>{\mathrm{W}}_{1}\right)$. If the current before and after change are ${\mathrm{I}}_{1}$ and ${\mathrm{I}}_{2}$, all other conditions remaining unchanged, then (assuming hv>${\mathrm{W}}_{2}$)

(a) ${\mathrm{I}}_{1}$= ${\mathrm{I}}_{2}$               (b) ${\mathrm{I}}_{1}$${\mathrm{I}}_{2}$
(c) ${\mathrm{I}}_{1}$>${\mathrm{I}}_{2}$                (d) ${\mathrm{I}}_{1}<{\mathrm{I}}_{2}<2{\mathrm{I}}_{1}$