Solve the Equation $$e ^ { 2 x } - 8 e ^ { x } + 12 = 0$$

Multiple Choice

Solve the equation. Give the answer in exact form.
- $$e ^ { 2 x } - 8 e ^ { x } + 12 = 0$$

A) $\left\{ \mathrm { e } ^ { 2 } , \mathrm { e } ^ { 6 } \right\}$
B) $\{ \ln 2 , \ln 6 \}$
C) $\left\{ \frac { 2 } { \mathrm { e } } , \frac { 6 } { \mathrm { e } } \right\}$
D) $\{ \ln ( - 2 ) , \ln ( - 6 ) \}$