The increasing order of bond order $O_2$, $O_2^+$, $O_2^-$, and $O_2^{2-}$ is:

Question

$O_2^+$, $O_2$, $O_2^-$, and $O_2^{2-}$

$O_2^{2-}$, $O_2^-$, $O_2^+$, and $O_2$

$O_2$, $O_2^+$, $O_2^-$, and $O_2^{2-}$

$O_2^{2-}$, $O_2^-$, $O_2$, and $O_2^+$

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