The angle of intersection of the curves y = 4 - x2 and y = x2 is

• A. \(tan^{-1} (\frac{4\sqrt{2}}{7})\)
• B. \(tan^{-1} (\frac{2}{7})\)
• C. \(tan^{-1} (\frac{3\sqrt{2}}{7})\)
• D. \(\frac{\pi}{2}\)