Standard reduction potential?

In conjunction with a standard hydrogen electrode, the La^3+|La half-cell is the anode and the standard cell potential is 2.52V. What is the standard reduction potential for the La^3+|La half-cell?





a. -2.52V


b. -0.84V


c. +0.84V


d. +2.52V

Standard reduction potential?
considering reduction potentials:


potential cell = E cathode - E anode





then 2.52 = 0 - E anode


E anode = -2.52 V