Joints $I,J,K,L,Q$ and $M$ of the frame shown in the figure (not drawn to the scale) are pins. Continuous members $IQ$ and $LJ$ are connected through a pin at $N$. Continuous members $JM$ and $KQ$ are connected through a pin at $P$. The frame has hinge supports at joints $R$ and $S$. The loads acting at joints $I,J$ and $K$ are along the negative $Y$ direction and the loads acting at joints $L$ and $M$ are along the positive $X$ direction.
The magnitude of the horizontal component of reaction $\text{(in kN)}$ at $S,$ is
1. $5$
2. $10$
3. $15$
4. $20$