Find an Equation for the Rational Function Graph $f ( x ) = \frac { 4 } { x ^ { 2 } + 1 }$

Multiple Choice

Find an equation for the rational function graph.
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A) $f ( x ) = \frac { 4 } { x ^ { 2 } + 1 }$
B) $f ( x ) = \frac { 4 } { x ^ { 2 } - 1 }$
C) $f ( x ) = \frac { 4 } { x ^ { 2 } - 3 }$
D) $f ( x ) = \frac { 4 } { x ^ { 2 } + 3 }$