Identify Any Intermediates or Catalysts in the Following Two-Step Reaction $\rightarrow$

Identify any intermediates or catalysts in the following two-step reaction: S₂O₈^2- + I^- $\rightarrow$ 2SO₄^2- + I⁺ I⁺ + I^- $\rightarrow$ I₂

A) S₂O₈^2- is an intermediate.
B) S₂O₈^2- is a catalyst.
C) I^- is a catalyst.
D) I⁺ is an intermediate.
E) SO₄^2- is a catalyst.