Rationalize the Denominator and Simplify $\sqrt { \frac { 36 } { x } }$

Multiple Choice

Rationalize the denominator and simplify. Assume that all variables represent positive real numbers.
- $\sqrt { \frac { 36 } { x } }$

A) $\frac { 36 \sqrt { 6 x } } { x }$
B) $\frac { 6 } { x }$
C) $\frac { 6 \sqrt { x } } { x ^ { 2 } }$
D) $\frac { 6 \sqrt { x } } { x }$