Mashaal Masha
$f(x)=x^{3}-9x$

$g(x)=x^{2}-2x-3$

Which of the following expressions is equivalent to $\frac{f(x)}{g(x)}$, for $x>3$?
Difficulty: Hard
A: 

$\frac{1}{x+1}$

B: 

$\frac{x+3}{x+1}$

C: 

$\frac{x(x-3)}{x+1}$

D: 

$\frac{x(x+3)}{x+1}$

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