Match the cell structures in $\text{Group I}$ with the organisms in $\text{Group II}$.

$\begin{array}{|l|l|l|l|} \hline & \text{Group I} && \text{Group II} \\ \hline P. & \text{Endospores} & 1. & \textit{Methanobacterium} \\ \hline Q. & \text{Bipolar flagella} & 2. & \textit{Treponema} \\ \hline R. & \text{Pseudomurine in cell wall} & 3. & \textit{Spirillum} \\ \hline S. & \text{Periplasmic flagella} & 4. & \textit{Clostridium} \\ \hline \end{array}$

1. $\text{P-4, Q-3, R-1, S-2}$
2. $\text{P-4, Q-3, R-2, S-1}$
3. $\text{P-3, Q-4, R-1, S-2}$
4. $\text{P-4, Q-1, R-3, S-2}$