One Resonance Structure for OCN^- Ion Is Drawn Below

One resonance structure for OCN^- ion is drawn below. What is the formal charge on each atom?

A) O atom = 0, C atom = 0, and N atom = 0
B) O atom = 0, C atom = 0, and N atom = -1
C) O atom = -1, C atom = 0, and N atom = 0
D) O atom = -1, C atom = -1, and N atom = +1
E) O atom = +1, C atom = 0, and N atom = -2