If $x = 6 \sin \theta$ , Use Trigonometric Substitution to Write

Multiple Choice

If $x = 6 \sin \theta$ , use trigonometric substitution to write $\sqrt { 36 - x ^ { 2 } }$ as a trigonometric function of $\theta$ , where $0 < \theta < \frac { \pi } { 2 }$ .

A) $6 \csc \theta$
B) $6 \sec \theta$
C) $6 \sin \theta$
D) $6 \cos \theta$
E) $6 \tan \theta$