$$4 ^ { x - 2 } = 6 ^ { 2 x - 2 }$$ Given that, what is the value of the expression $9 ^ { \mathbf { x } }$?\\ A) $\frac { 9 } { 2 }$\\ B) $\frac { 4 } { 3 }$\\ C) $\frac { 8 } { 3 }$\\ D) $\frac { 5 } { 4 }$\\ E) $\frac { 9 } { 4 }$