Consider the function $f(x)=2x^3-3x^2-x+1$ and the intervals $I_1=[-1,0]$, $I_2=[0,1]$, $I_3=[1,2]$, $I_4=[-2,-1]$. Then,

  • A
    $f(x)=0$ has a root in the intervals $I_1$ and $I_4$ only
  • B
    $f(x)=0$ has a root in the intervals $I_1$ and $I_2$ only
  • C
    $f(x)=0$ has a root in every interval except in $I_4$
  • D
    $f(x)=0$ has a root in all the four given intervals

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