(a) $\mathrm{CoCl}_3 \cdot 4 \mathrm{NH}_3$
(b) $\mathrm{CoCl}_3 \cdot 5 \mathrm{NH}_3$
(c) $\mathrm{CoCl}_3 \cdot .6 \mathrm{NH}_3$ and
(d) $\mathrm{CoCl}\left(\mathrm{NO}_3\right)_2 \cdot 5 \mathrm{NH}_3$
Number of complex(es) which will exist in cistrans is/are
