URGENT CALCULUS QUESTION: INTEGRALS

The definite integral of {(x) from a to b is defined to be: b O A. [ Ax jax = F(b) - F(a) b O B. [A(x)dx = lim X- 00 k=1 b C. [Axjax = lim Ef(wkJAXK kc=1 b O D. [fxjax = lim 1+00 k=n b O E. [ A(x)dax = Fla) - F(b)