Solve the Exponential Equation by Taking a Logarithm of Both $$7 ^ { a } = 15$$

Multiple Choice

Solve the exponential equation by taking a logarithm of both sides. $$7 ^ { a } = 15$$

A) $\left\{ \ln \frac { 15 } { 7 } \right\}$
B) $\left\{ \ln \frac { 7 } { 15 } \right\}$
C) $\left\{ \frac { \ln 15 } { \ln 7 } \right\}$
D) $\left\{ \frac { \ln 7 } { \ln 15 } \right\}$