Which of the following statements about the oxygen species $\mathrm{O}{}_2$, $\mathrm{O}{}_2{}^{+}$, $\mathrm{O}{}_2{}^{-}$ and $\mathrm{O}{}_2{}^{2-}$ is/are correct?

1. A$\mathrm{O}{}_2{}^{+}$ has a shorter bond than $\mathrm{O}{}_2$
2. B$\mathrm{O}{}_2{}^{-}$ is paramagnetic
3. C$\mathrm{O}{}_2{}^{2-}$ is paramagnetic
4. D$\mathrm{O}{}_2{}^{-}$ has a higher bond dissociation energy than $\mathrm{O}{}_2$