In which of the following processes, the bond order increases and paramagnetic character changes to diamagnetic one ?

Question

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

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

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

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

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