$\begin{array}{1 1} \text{(a) Homogeneous and liquid-in-gas mixtures} \\ \text{
(b) Heterogeneous and liquid-in-liquid mixtures} \\ \text{
(c) Homogeneous and solid-in-liquid mixtures} \\ \text{
(d) Heterogeneous and solid-in-liquid mixtures.}
\end{array} $
