Which of the following is not expected to show paramagnetism?

Options

1. A\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)\right]^{2+}
2. B$\mathrm{Ni}(\mathrm{CO})_4$
3. C\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_4\right]^{2+}
4. D\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{2+}