Perform the Indicated Operation and Write Your Answer with Positive $$\frac { x ^ { 2 } - 49 y ^ { - 2 } } { \left( x - 7 y ^ { - 1 } \right) \left( x + 7 y ^ { - 1 } \right) }$$

Multiple Choice

Perform the indicated operation and write your answer with positive integer exponents.
- $$\frac { x ^ { 2 } - 49 y ^ { - 2 } } { \left( x - 7 y ^ { - 1 } \right) \left( x + 7 y ^ { - 1 } \right) }$$

A) $\frac { x y ^ { 2 } } { y - x }$
B) 1
C) $\frac { y ^ { 2 } - x } { x y - 7 }$
D) $- 1$