In which of the following processes, the bond order has increased and paramagnetic character has changed to diamagnetic ?

$\mathrm{N}_{2} \rightarrow \mathrm{N}_{2}^{+}$

$\mathrm{NO} \rightarrow \mathrm{NO}^{+}$

$\mathrm{O}_{2} \rightarrow \mathrm{O}_{2}^{2-}$

$\mathrm{O}_{2} \rightarrow \mathrm{O}_{2}^{+}$