$\begin{array}{ll}
\text{1. Human parasite} &\text{a. Vibrio cholerae} \\
\text{2. Plant parasite }&\text{b. Bacillus anthracis} \\
\text{3. Animal parasite} &\text{c. Bacillus subtilis } \\
\text{4. saprotrophic} & \text{d. Xanthomonas citrii} \\
\end{array}$
