If $y = log_e \left(\frac{x^3}{e^3}\right),$ then $\frac{d^2y}{dx^2} $ is equal to

$\frac{3}{x^2}$ $-\frac{2}{x^2}$ $-\frac{3}{x^2}$ $-\frac{2}{x}$

$-\frac{3}{x^2}$