Perform the Requested Operation or Operations $$f ( x ) = 5 x + 4 ; g ( x ) = 4 x - 5$$

Perform the requested operation or operations. Find the domain of each.
- $$f ( x ) = 5 x + 4 ; g ( x ) = 4 x - 5$$
Find f/g.

A) $( f / g ) ( x ) = \frac { 5 x + 4 } { 4 x - 5 } ;$ domain $\left\{ x \mid x \neq - \frac { 4 } { 5 } \right\}$
B) $( \mathrm { f } / \mathrm { g } ) ( \mathrm { x } ) = \frac { 5 \mathrm { x } + 4 } { 4 \mathrm { x } - 5 }$ ; domain $\left\{ x \mid x \neq \frac { 5 } { 4 } \right\}$
C) $( f / g ) ( x ) = \frac { 4 x - 5 } { 5 x + 4 } ;$ domain $\left\{ x \mid x \neq \frac { 5 } { 4 } \right\}$
D) $( f / g ) ( x ) = \frac { 4 x - 5 } { 5 x + 4 } ;$ domain $\left\{ x \mid x z - \frac { 4 } { 5 } \right\}$