Below Are Two Resonance Forms of Nitrogen Monoxide

Below are two resonance forms of nitrogen monoxide. Which of the two structures is the preferred resonance form and why?

A) Structure I is the preferred structure because the formal charge of each atom in the structure equals zero.
B) Structure I is the preferred structure because it obeys the octet rule for each atom in the structure.
C) Structure II is the preferred structure because the formal charge of each atom in the structure equals zero.
D) Structure II is the preferred structure because it obeys the octet rule for each atom in the structure.
E) These are equivalent resonance forms.