The Redox Reaction of Peroxydisulfate with Iodide Has Been Used $\to$

The redox reaction of peroxydisulfate with iodide has been used for many years as part of the iodine clock reaction which introduces students to kinetics. If E°_cell = 1.587 V and E° of the cathode half-cell is 0.536 V, what is E° of the anode half-cell?
S₂O₈^2-(aq) + 2H⁺ + 2I^-(aq) $\to$ 2HSO₄^-(aq) + I₂(aq)

A) -1.051 V
B) -2.123 V
C) 1.051 V
D) 2.123 V
E) none of the above