Write an Equivalent Expression in Exponential Form $$\log _ { 7 } \frac { 1 } { 49 } = x$$

Multiple Choice

Write an equivalent expression in exponential form.
- $$\log _ { 7 } \frac { 1 } { 49 } = x$$

A) $\left\{ \frac { 1 } { 7 } \right\}$
B) $\{ - 2 \}$
C) $\{ 2 \}$
D) $\left\{ \frac { 1 } { 343 } \right\}$