Given F(x) and G(x), Find the Indicated Composition and State $$f ( x ) = \frac { x - 5 } { 9 } ; g ( x ) = 9 x + 5$$

Given f(x) and g(x) , find the indicated composition and state its domain.
- $$f ( x ) = \frac { x - 5 } { 9 } ; g ( x ) = 9 x + 5$$
Find $( g \circ f ) ( x )$ .

A) $x - \frac { 5 } { 9 }$ , all real numbers
B) $x + 10$ , all real numbers
C) $x$ , all real numbers
D) $9 x + 40$ , all real numbers