The Redox Reaction of Peroxydisulfate with Iodide Has Been Used

The redox reaction of peroxydisulfate with iodide has been used for many years as part of the iodine clock reaction. 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) → 2HSO₄^-(aq) + I₂(aq)

A) -1.051 V
B) -2.123 V
C) 1.051 V
D) 2.123 V
E) None of these choices is correct.