Determine the Domain of the Function $f ( x ) = \frac { x ^ { 2 } - 9 } { x ^ { 2 } + 4 x + 3 }$

Multiple Choice

Determine the domain of the function $f ( x ) = \frac { x ^ { 2 } - 9 } { x ^ { 2 } + 4 x + 3 }$ .

A) Domain: all real numbers except x = -3 and 1
B) Domain: all real numbers except x = 1
C) Domain: all real numbers except x = -3 and -1
D) Domain: all real numbers except x = 3 and 1
E) Domain: all real numbers