If the function \( f(x)=x^{3}-9 k x^{2}+27 x+30 \) is increasing on \( R \), then (a) \( -1 \leq...

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If the function \( f(x)=x^{3}-9 k x^{2}+27 x+30 \) is increasing on \( R \), then
(a) \( -1 \leq k1 \)
(b) \( k-1 \) or \( k1 \)
(c) \( 0k1 \)
(d) \( -1k0 \)
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