On the basis of the following E^{\circ} values, the strongest oxidizing agent is : [ {\Fe}( {\CN})_6]^{4-} \to[ {\Fe}( {\CN})_6]^{3-}+ {\e}^{-1}, {\E}^0=-0.35 {\V} {\Fe}^{2+} \to {\Fe}^{3+}+ {\e}^{-1}, {\E}^{\circ}=-0.77 {\V}

Correct Answer is : [Fe(CN)6]3−