Which of the following describes the behavior of f(x)=x4−4x3+6x2−4x+1f(x) = x^4 - 4x^3 + 6x^2 - 4x + 1f(x)=x4−4x3+6x2−4x+1 at x=1x=1x=1?
Local maximum
Local minimum
Inflection point
None of the above