Which set of hybridization states of C1, C2, and N of the following molecule is correct?
C1. \( \mathrm{C}_{2} \)
a. \( \mathrm{C} 1 \mathrm{sp}^{2}, \mathrm{C} 2 s p^{3}, \mathrm{~N} s p^{3} \)
b. \( C 1 s p^{2}, C 2 s p^{2}, N s p^{3} \)
c. \( \mathrm{C} 1 \mathrm{sp}^{2}, \mathrm{C} 2 \mathrm{sp}^{2}, \mathrm{Nsp}{ }^{2} \)
d. \( \mathrm{C} 1 \mathrm{sp}^{2}, \mathrm{C} 2 \mathrm{sp}^{2}, \mathrm{Nsp}{ }^{2} \)