$\text { Find an equation of the tangent line to the graph of the function } f ( x ) = \sqrt { x - 2 } \text { at }$

Multiple Choice

$\text { Find an equation of the tangent line to the graph of the function } f ( x ) = \sqrt { x - 2 } \text { at }$ the point $( 18,4 )$ .

A) $y = \frac { x } { 4 } + \frac { 7 } { 2 }$
B) $y = \frac { x } { 8 } + \frac { 7 } { 4 }$
C) $y = \frac { x } { 8 } + \frac { 9 } { 2 }$
D) $y = \frac { x } { 4 } + \frac { 9 } { 2 }$
E) $y = \frac { x } { 8 } + \frac { 9 } { 4 }$