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$\lim_{x \to\infty}f(x)$ is largest for which of the following functions?

$f(x)=\cfrac{\sin{x}}{x}$

$f(x)=\cfrac{e^x}{x^3}$

$f(x)=10x^5-4x^2$

$f(x)=\cfrac{1}{x}$