Filtration as a method of separation can be used for mixtures that are

Question

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