Find the Value Of $x$ $\log _ { 81 } x = \frac { 1 } { 2 }$

Multiple Choice

Find the value of $x$ . $\log _ { 81 } x = \frac { 1 } { 2 }$

A) 9
B) $\frac { 1 } { 9 }$
C) 2
D) $\frac { 1 } { 2 }$
E) $1$