The derivative of f(x) = \(\int\limits_{\text x^2}^{\text x^3}\cfrac{1}{log_et}dt,
\) (x > 0), is
A. \(\cfrac{1}{3\,In\,\text x}\)
B. \(\cfrac{1}{3\,In\,\text x}\) - \(\cfrac{1}{2\,In\,\text x}\)
C. (In x)-1 x(x -1)
D. \(\cfrac{3\text x^2}{3\,In\,\text x}\)