Filtration is a method of separation of mixtures that are

Question

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