If $f ( x ) = \frac { 9 } { x } \text { and } g ( x ) = \frac { 9 } { x - 2 } \text {, }$

Multiple Choice

If $f ( x ) = \frac { 9 } { x } \text { and } g ( x ) = \frac { 9 } { x - 2 } \text {, }$ find $( f \circ g ) ( 4 )$ .

A) 4
B) 2
C) $-$ 2
D) $-$ 3