In $N_{\mathit{B}}$ is the number of bonding electrons and $N_A$ is the number of antibonding electrons of a molecular species. Then choose the incorrect statement(s) for the given relationship.

$N_B>N_A$

Molecular species may be stable or unstable

Molecular species does not exist

Molecular species is only paramagnetic species

Molecular species may have any integral, fractional or zero value of bond order