Below Is a Proposed Mechanism for the Decomposition of H₂O₂

Below is a proposed mechanism for the decomposition of H₂O₂.
H₂O₂ + I^- → H₂O + IO^-
Slow
H₂O₂ + IO^- → H₂O + O₂ + I^-
Fast
Which of the following statements is incorrect?

A) IO^- is a catalyst.
B) I^- is a catalyst.
C) The net reaction is 2H₂O₂ → 2H₂O + O₂.
D) The reaction is first-order with respect to [I^-].
E) The reaction is first-order with respect to [H₂O₂].