Solve the Equation and Express the Solution in Exact Form $\log _ { 7 } x ^ { 2 } = ( \log 7 x ) ^ { 2 }$

Multiple Choice

Solve the equation and express the solution in exact form.
- $\log _ { 7 } x ^ { 2 } = ( \log 7 x ) ^ { 2 }$

A) $\{ 49 \}$
B) $\{ 0,7 \}$
C) $\{ 1,49 \}$
D) $\{ 1,7 \}$