A symmetric frame $PQR$ consists of two inclined members $PQ$ and $QR$, connected at $‘Q’$ with a rigid joint, and hinged at $‘P’$ and $‘R’$. The horizontal length $PR$ is $l$. If a weight $W$ is suspended at $‘Q’$, the bending moment at $‘Q’$ is

1. $\dfrac{Wl}{2} \\$
2. $\dfrac{Wl}{4} \\$
3. $\dfrac{Wl}{8} \\$
4. zero