Which option(s) correctly match(es) the Polymer property with its appropriate Units?
\[
\begin{array}{|c|c|}
\hline
\text{Polymer property} & \text{Units} \\
\hline
P: \text{Hildebrand solubility parameter} & 1: \text{Pa} \\
Q: \text{Loss modulus} & 2: \text{J m}^{-3} \\
R: \text{Toughness} & 3: (\text{MPa})^{1/2} \\
S: \text{Flexural strength} & 4: \text{Kg m}^{-1}\text{s}^{-2} \\
\hline
\end{array}
\]