If \( f(x)=k x^{3}-9 x^{2}+9 x+3 \) is increasing for every real nu...

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If \( f(x)=k x^{3}-9 x^{2}+9 x+3 \) is increasing for every real number \( x \), then
\( \mathrm{P} \)
(a) \( k3 \)
(b) \( k \geq 3 \)
(c) \( k3 \)
(d) \( k \leq 3 \)
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