A cantilever beam $\textbf{PQ}$ of uniform flexural rigidity (EI) is subjected to a concentrated moment M at $\textbf{R}$ as shown in the figure

The deflection at the free end $\textbf{Q}$ is

1. $\large\frac{ML^2}{6EI} \\$
2. $\large\frac{ML^2}{4EI} \\$
3. $\large\frac{3ML^2}{8EI} \\$
4. $\large\frac{3ML^2}{4EI}$

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