If X = 2 Tan $\theta$ , Use Trigonometric Substitution to Write

Multiple Choice

If x = 2 tan $\theta$ , use trigonometric substitution to write $\sqrt { 4 + x ^ { 2 } }$ as a trigonometric function of $\theta$ , where $0 < \theta < \frac { \pi } { 2 }$ .

A) 2 cos $\theta$
B) 2 tan $\theta$
C) 2 sin $\theta$
D) 2 sec $\theta$
E) 2 csc $\theta$