The range of values of a, such that `f(x)= (ax^(2) +2(a+1) x+9a+4)/(x^(2)-8x+32)` is always negative is

Options

A. `(-oo, 1//2)`
B. `(-1//2, 0)`
C. `(-oo, -1//2)`
D. `(-1//2, 1//2)`

Answer

C