Write an Equivalent Expression in Exponential Form $$\log _ { x } 49 = - 2$$

Multiple Choice

Write an equivalent expression in exponential form.
- $$\log _ { x } 49 = - 2$$

A) $\{ 7 \}$
B) $\{ - 7 \}$
C) $\left\{ - \frac { 1 } { 7 } \right\}$
D) $\left\{ \frac { 1 } { 7 } \right\}$