Find $\lim _ { x \rightarrow + \infty } f ( x )$

Multiple Choice

Find $\lim _ { x \rightarrow + \infty } f ( x )$ and $\lim _ { x \rightarrow - \infty } f ( x )$ . If the limiting value is infinite indicate whether it is + $\infty$ or - $\infty$ . $f ( x ) = \frac { 1 - 4 x ^ { 3 } } { 5 x ^ { 3 } - 9 x - 3 }$

A) $- \frac { 4 } { 5 } , \frac { 4 } { 5 }$
B) $- \frac { 4 } { 5 } , - \frac { 4 } { 5 }$
C) + $\infty$ ,- $\infty$
D) - $\infty$ ,+ $\infty$