If \[y={{\sin }^{-1}}\frac{2x}{1+{{x}^{2}}},\]where \[0

• A. \[\frac{2}{1+{{x}^{2}}}\]
• B. \[\frac{2x}{1+{{x}^{2}}}\]
• C. \[\frac{-2}{1+{{x}^{2}}}\]
• D. \[\frac{-x}{1+{{x}^{2}}}\]