If expression x^2-4cx+b^2gt0 for all x e...

If expression `x^2-4cx+b^2gt0 for all x epsilon R and a^2+c^2ltab` then range of the function `(x+a)/(x^2+bx+c^2)` is (A) `(0,oo)` (B) `(0,oo)` (C) `(-oo,oo)` (D) none of these

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