Which of the following forms a set of a complex and a double salt,...

Which of the following forms a set of a complex and a double salt, respectively?

Options

A $\mathrm{K}_2 \mathrm{PtCl}_2 \cdot 2 \mathrm{NH}_3$ and $\mathrm{KAl}\left(\mathrm{SO}_4\right)_2 \cdot 12 \mathrm{H}_2 \mathrm{O}$
B\mathrm{NiCl}_2 \cdot 6 \mathrm{H}_2 \mathrm{O} $and$ \mathrm{NiCl}_2\left(\mathrm{H}_2 \mathrm{O}\right)_4
C $\mathrm{CuSO}_4 \cdot 5 \mathrm{H}_2 \mathrm{O}$ and $\mathrm{CuCl}_2 \cdot 4 \mathrm{NH}_3$
D $\mathrm{PtCl}_2 \cdot 2 \mathrm{NH}_3$ and $\mathrm{PtCl}_4 \cdot 2 \mathrm{HCl}$

A. $\mathrm{K}_2 \mathrm{PtCl}_2 \cdot 2 \mathrm{NH}_3$ and $\mathrm{KAl}\left(\mathrm{SO}_4\right)_2 \cdot 12 \mathrm{H}_2 \mathrm{O}$

\mathrm{K}_2 \mathrm{PtCl}_2 \cdot 2 \mathrm{NH}_3

is complex compound Which of the following forms a set of a complex and a double salt, respectively?

\mathrm{KAl}\left(\mathrm{SO}_4\right)_2 \cdot 12 \mathrm{H}_2 \mathrm{O}

is empirical formula of potash alum which is a double salt

\mathrm{K}_2 \mathrm{SO}_4 \cdot \mathrm{Al}_2\left(\mathrm{SO}_4\right)_3 \cdot 24 \mathrm{H}_2 \mathrm{O}