Determine the reference angle for an angle measuring $\(\frac{9\pi}{7}\)$.

• A. $\(\frac{11\pi}{14}\)$
• B. $\(\frac{5\pi}{7}\)$
• C. $\(\frac{3\pi}{14}\)$
• D. $\(\frac{2\pi}{7}\)$

Answer: (D)