Find the Values of X Where the Tangent Line Is $f ( x ) = \frac { 4 x ^ { 2 } } { x + 2 }$

Multiple Choice

Find the values of x where the tangent line is horizontal for the graph of $f ( x ) = \frac { 4 x ^ { 2 } } { x + 2 }$ .

A) x = 0, x = -4
B) x = 0, x = -2
C) x = -2
D) x = -2, x = 0, x = -4