The bending moment of a cantilever beam of length $$l$$ and carrying a gradually varying load from zero at free end and w per unit length at the fixed end is ________ at the fixed end.

A. $$\frac{{{\text{w}}l}}{2}$$

B. $${\text{w}}l$$

C. $$\frac{{{\text{w}}{l^2}}}{2}$$

D. $$\frac{{{\text{w}}{l^2}}}{6}$$

Answer: Option D