Deflection of the free end of a cantilever beam having a concentrated load W at mid span is given by

A

$$\frac{W L^{3}}{3}$$ EI

B

5 $$\frac{W L^{3}}{24}$$ EI

C

5 $$\frac{W L^{3}}{48}$$ WI

D

$$\frac{W L^{3}}{48}$$ EI