Which of the following complex is/are homoleptic:
| a. | \( {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}} \) | b. | \( {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right]^{2+}} \) |
| c. | \( {\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}}\) | d. | \(\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]\) |
Choose the correct option.
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)
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