Cud is the name given to the food of ruminants which is

Question

$\begin{array}{1 1} (a)\; \text{Swallowed and undigested} \\ (b)\; \text{Swallowed and partially digested} \\ (c)\; \text{Properly chewed and partially digested } \\ (d)\; \text{Properly chewed and completely digested} \end{array}$