Find the Oblique Asymptote, If Any, of the Rational Function $$f ( x ) = \frac { x ^ { 3 } - 5 x ^ { 2 } + 4 x - 1 } { x ^ { 2 } + 4 x }$$

Multiple Choice

Find the oblique asymptote, if any, of the rational function.
- $$f ( x ) = \frac { x ^ { 3 } - 5 x ^ { 2 } + 4 x - 1 } { x ^ { 2 } + 4 x }$$

A) $y = x - 9$
B) $y = x + 9$
C) None
D) $y = x$