The ultimate collapse load $(P)$ in terms of plastic moment $M_p$ by kinematic approach for a propped cantilever of length $L$ with $P$ acting at its mid-span as shown in the figure, would be

1. $P=\dfrac{2M_p}{L} \\$
2. $P=\dfrac{4M_p}{L} \\$
3. $P=\dfrac{6M_p}{L}\\$
4. $P=\dfrac{8M_p}{L}$