The function $f(x)=x^{4}-4 x^{3}+6 x^{2}-4 x+1$ has a

(A) Maxima at $x=0$

(B) Minima at $x=0$

(C) Maxima at $x=1$

(D) Minima at $x=1$

The function $f(x)=x^{4}-4 x^{3}+6 x^{2}-4 x+1$ has a

(A) Maxima at $x=0$

(B) Minima at $x=0$

(C) Maxima at $x=1$

(D) Minima at $x=1$

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