Match the immunoglobulin class in $\text{Group I}$ with its properties in $\text{Group II}$

$\begin{array}{|l|l|l|l|} \hline & \textbf{Group I} && \textbf{Group II} \\ \hline P. & \text{IgG} & 1. & \text{Major antibody in external sections} \\ &&& \text{such as bronchial mucus} \\ \hline Q. & \text{IgA} & 2. & \text{Protects against parasites} \\ \hline R. & \text{IgE} & 3. & \text{Antibody that appears first in serum} \\ &&& \text{after exposure to an antigen} \\ \hline S. & \text{IgM} & 4. & \text{Antobody present in highest} \\ &&& \text{concentration in serum} \\ \hline \end{array}$

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