If the normal at any point P on ellipse `(x^(2))/(a^(2))+(y^(2))/(b^(2)) =1` meets the auxiliary circle at Q and R such that `/_QOR = 90^(@)` where O is centre of ellipse, then
A. `a^(4) +2b^(3) ge 3a^(2)b^(2)`
B. `a^(4) +2b^(4) ge 5a^(2)b^(2)+2a^(3)b`
C. `a^(4)+2b^(4) ge 3a^(2)b^(2)+ab`
D. None of these