Match List-I with List-II
\[
\begin{array}{|l|l|}
\hline
\textbf{List-I} & \textbf{List-II} \\
\hline
(A) \; P \text{ and } Q \text{ are two perpendicular forces, acting at a point} & (I) \; R = |P - Q| \\
(B) \; P \text{ and } Q \text{ are equal, forces acting at a point at an angle } \alpha & (II) \; R = P + Q \\
(C) \; P \text{ and } Q \text{ are acting at a point in same direction} & (III) \; R = 2P \cos(\tfrac{\alpha}{2}) \\
(D) \; P \text{ and } Q \text{ are acting at a point in opposite direction} & (IV) \; R = \sqrt{P^2 + Q^2} \\
\hline
\end{array}
\]
Choose the correct answer from the options given below: