Solve the Equation $\log _{4}(\mathrm{x}-1)+\log _{4}(\mathrm{x}-7)=2$ A) $\varnothing$ B) $\{-1\}$ C) $\{9,-1\}$ D) $\{9\}$

Multiple Choice

Solve the equation.
- $\log _{4}(\mathrm{x}-1) +\log _{4}(\mathrm{x}-7) =2$

A) $\varnothing$
B) $\{-1\}$
C) $\{9,-1\}$
D) $\{9\}$