Counting morphisms between specified groups
Determine the number of group homomorphisms
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Determine the number of group homomorphisms $\phi$ between the given groups. Here $K_4$ denotes the Klein four-group (also known as ${\bf Z}/2{\bf Z}\times {\bf Z}/2{\bf Z}$) and $S_3$ denotes the symmetric group on three elements.
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\begin{enumerate}[label=(\alph*)]
\item $\phi:K_4\to {\bf Z}/2{\bf Z}$
\item $\phi:{\bf Z}/2{\bf Z}\to K_4$
\item $\phi:S_3\to K_4$
\item $\phi:K_4\to S_3$
\end{enumerate}