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

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 $\degree$ _cell = 1.587 V and E $\degree$ of the cathode half-cell is 0.536 V, what is E $\degree$ of the anode half-cell?

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