The maximum deflection due to a uniformly distributed load w/unit length over entire span of a cantilever of length l and of flexural rigidity EI, is

A

$$ WL^3 / 3EI $$

B

$$ WL^4 / 3EI $$ 

C

$$ WL^4 / 8EI $$ 

D

$$ WL^4 / 12EI $$