What are the four types of soil erosion due to rainfall?

Question

$\begin{array}{1 1} (a)\; \text{splash erosion, sheet erosion, rill erosion and gully erosion} \\ (b)\; \text{splash erosion, stream erosion, rill erosion, water erosion} \\ (c)\; \text{bank erosion, thermal erosion, rill erosion, splash erosion} \\ (d)\; \text{ocean erosion,bank erosion,sheet erosion and gully erosion} \end{array}$