Which of the configuration is correct :-

• A

  $CO : \sigma ls^2 ..... \sigma 2pz^2, \pi 2py^2$

• B

  $CN^-: \sigma 1s^2 ..... \sigma 2pz^2, \pi 2px^2$

• C

  $NO : \sigma 1s^2 ..... \pi^*2px^1, \pi^*2py^0$

• D

  $N_2^+ : \sigma 1s^2 ..... \sigma 2pz^2, \pi 2py^1$