Give the Equation of the Horizontal Asymptote, If Any, of the Function

Multiple Choice

Give the equation of the horizontal asymptote, if any, of the function.
- $$f ( x ) = \frac { x ^ { 2 } - 7 } { 49 x - x ^ { 4 } }$$

A) no horizontal asymptotes
B) $y = - 1$
C) $y = - 7 , y = 7$
D) $y = 0$