Solve the Equation and Express the Solution in Exact Form $\ln \mathrm { e } ^ { \mathrm { x } } - \ln \mathrm { e } ^ { 7 } = \ln \mathrm { e } ^ { 4 }$

Multiple Choice

Solve the equation and express the solution in exact form.
- $\ln \mathrm { e } ^ { \mathrm { x } } - \ln \mathrm { e } ^ { 7 } = \ln \mathrm { e } ^ { 4 }$

A) $\{ 3 \}$
B) $\{ - 3 \}$
C) $\{ 11 \}$
D) $\{ 28 \}$