The range of values of \( a \), such that \[ f(x)=\frac{a x^{2}+2(a+1) x+9 a+4}{x^{2}-8 x+32} \]...
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0The range of values of \( a \), such that
\[
f(x)=\frac{a x^{2}+2(a+1) x+9 a+4}{x^{2}-8 x+32}
\]
is always negative is
(A) \( (-\infty, 1 / 2) \)
(B) \( (-1 / 2,0) \)
(C) \( (-\infty,-1 / 2) \)
(D) \( (-1 / 2,1 / 2) \)
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