The Elementary Steps for the Catalyzed Decomposition of Dinitrogen Monoxide $\to$

Multiple Choice

The elementary steps for the catalyzed decomposition of dinitrogen monoxide are shown below.
N₂O(g) + NO(g) $\to$ N₂(g) + NO₂(g)
NO₂(g) $\to$ NO(g) + 1/2 O₂(g)
Which of the following statements is/are CORRECT?
1) The overall balanced reaction is N₂O(g) $\to$ N₂(g) + 1/2 O₂(g) .
2) NO₂(g) is a catalyst for the reaction.
3) NO(g) is a reaction intermediate.

A) 1 only
B) 2 only
C) 3 only
D) 1 and 3
E) 1,2,and 3