Find the Domain Of $f ( x ) = \frac { x - 7 } { x ^ { 2 } - 49 }$

Multiple Choice

Find the domain of $f ( x ) = \frac { x - 7 } { x ^ { 2 } - 49 }$ .

A) all real numbers except x = -7
B) all real numbers except x = 49
C) all real numbers except x = 7
D) all real numbers except x = 7 and x = -7
E) all real numbers