Solve this following


Mark $(\sqrt{)}$ against the correct answer in the following:

The function $f(x)=4-3 x+3 x^{2}-x^{3}$ is

A. decreasing on $\mathrm{R}$

B. increasing on $\mathrm{R}$

C. strictly decreasing on $R$

D. strictly increasing on $R$


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