Question:
Mark $(\sqrt{)}$ against the correct answer in the following:
If $f(\mathrm{x})=\mathrm{kx}^{3}-9 \mathrm{x}^{2}+9 \mathrm{x}+3$ is increasing for every real number $\mathrm{x}$, then
A. $k>3$
B. $k \geq 3$
C. $k<3$
D. $k \leq 3$
Solution:
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