Find the Derivative of the Function $y=\ln (x-4)$ A) $\frac{1}{4-x}$ B) $-\frac{1}{x+4}$ C) $\frac{1}{x-4}$

Find the derivative of the function.
- $y=\ln (x-4)$

A) $\frac{1}{4-x}$
B) $-\frac{1}{x+4}$
C) $\frac{1}{x-4}$
D) $\frac{1}{x+4}$