The Following Mechanism Has Been Suggested for the Reaction Between

The following mechanism has been suggested for the reaction between nitrogen monoxide and oxygen:
NO(g) + NO(g) → N₂O₂(g) (fast)
N₂O₂(g) + O₂(g) → 2NO₂(g) (slow)
According to this mechanism,the experimental rate law is

A) second-order in NO and zero-order in O₂.
B) second-order in NO and first-order in O₂.
C) first-order in NO and first-order in O₂.
D) first-order in NO and second-order in O₂.
E) first-order in NO and zero-order in O₂.