Which of the following is equal to \sqrt{9-6 \sqrt{2}}+\sqrt{9+6 \sqrt{2}} ?

**Answer Choices**

A. 3 \sqrt{2}

B. 2 \sqrt{6}

C. \dfrac{7 \sqrt{2}}{2}

D. 3 \sqrt{3}

E. 6

Which of the following is equal to \sqrt{9-6 \sqrt{2}}+\sqrt{9+6 \sqrt{2}} ?

**Answer Choices**

A. 3 \sqrt{2}

B. 2 \sqrt{6}

C. \dfrac{7 \sqrt{2}}{2}

D. 3 \sqrt{3}

E. 6