Find the Equation of the Tangent Line to the Graph $x = 4$

Multiple Choice

Find the equation of the tangent line to the graph of the given function at the point with $x = 4$ . $f ( x ) = \frac { x + 4 } { x + 1 }$

A) $y = - 0.12 x$
B) $y = 0.12 x + 1.12$
C) $y = - 1.6$
D) $y = - 0.12 x + 2.08$
E) $y = 1.6$