Evaluate and Simplify $f ( x ) = \frac { x } { x + 2 }$

Multiple Choice

Evaluate and simplify $f ( x ) = \frac { x } { x + 2 }$ at x=4 .

A) $f ( 4 ) = - \frac { 2 } { 3 }$
B) $f ( 4 ) = \frac { 1 } { 3 }$
C) $f ( 4 ) = \frac { 2 } { 3 }$
D) $f ( 4 ) = \frac { 3 } { 2 }$
E) $f ( 4 ) = - \frac { 3 } { 2 }$