A variety of genetic elements are used in the transgenic plant research. Match the genetic elements (Column-I) with their corresponding source (Column-ll).
$\begin{array}{|l|l|l|l|} \hline & \textbf{Column-I} && \textbf{Column-II} \\ \hline P. & \textit{Ubiquitin 1} \text{ promoter} & 1. & \textit{Agrobactererium tumefaciens} \\ \hline Q. & \textit{Nos} \text{ transcriptional terminator} & 2. & \textit{Streptomyces hygroscopicus} \\ \hline R. & \textit{bar} \text{ selection marker gene} & 3. & \textit{Escherichia coli} \\ \hline S. & \textit{gus } \text{reporter gene} & 4. & \textit{Zea mays} \\ \hline \end{array}$
- $\text{P-2, Q-1, R-3, S-4}$
- $\text{P-2, Q-3, R-4, S-1}$
- $\text{P-3, Q-4, R-1, S-2}$
- $\text{P-4, Q-1, R-2, S-3}$