Let `f"[0,oo)rarr R` be a continuous and stricity increasing function such that `f^(3) (x) =int_(0)^(x) tf^(2)(t) dt, x ge0`.
The area enclosed by `y = f(x)` , the x-axis and the ordinate at `x = 3` is ` "_______"`
A. `3/2`
B. `5/2`
C. `7/2`
D. `1/2`
