Which of the following is correct order of I.E. ?

N2 > CO in I.E. because in N2 last electron present in B.M.O and in CO last electron present in slightly A.B.M.O.N2 > O2 because in N2 last electron present in B.M.O and in O2 last electron present in A.B.M.O. N > O because 2p3 electronic configuration is more stable then 2p4 of oxygen atom.