$(3$ points$)$ Consider the cantilevered beam with a distrib$$ted load given by $w(x)$ as show below.

The magnitude of the moment of the distributed load about the left end of the beam $($point $"A")$ would be evaluated using which of the following equations? Multiple choice; choose one.

a$){\displaystyle \underset{0}{\overset{L}{}}}{x}^{2}w(x)dx$

b$){\displaystyle \underset{0}{\overset{L}{}}}{x}^2(\frac{dw(x)}{dx})dx$

c$){\displaystyle \underset{0}{\overset{L}{}}}{x}^{(\frac{L}{2})}w(x)dx$

d$){\displaystyle \underset{0}{\overset{L}{}}}xw(x)dx$

e$){\displaystyle \underset{0}{\overset{L}{}}}x(\frac{dw(x)}{dx})dx$