The correct one among the following statements about $N_2$ is

Question

$\begin{array}{1 1}(a)\;\text{it has two unpaired electrons}\\(b)\;\text{the bond order is 2.5}\\(c)\;\text{the highest occupied molecular orbital is }3\sigma_g\\(d)\;\text{the lowest occupied molecular orbital is }2p\pi_x^*\end{array}$