For a cantilever beam of length L carrying a triangular load of intensity 'w' at the support and zero at the free end, the slope of the free end is given by

A

$$\frac{WL^3}{24 EI}$$

B

$$\frac{WL^3}{48 EI}$$

C

$$\frac{WL^3}{8 EI}$$

D

$$\frac{WL^3}{12 EI}$$