Which of the following is a pair of diamagnetic complexes?

Options

1. A\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+},$\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}$
2. B\left[\mathrm{Co}(o x)_3\right]^{3-},$\left[\mathrm{FeF}_6\right]^{3-}$
3. C\left[\mathrm{Fe}(o x)_3\right]^{3-},$\left[\mathrm{FeF}_6\right]^{3-}$
4. D\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-},$\left[\mathrm{CoF}_6\right]^{3-}$