If $f(x)=a \log |x|+b x^2+x$ has extreme values at $x=-1$ and $x=2$,then the ordered pair $(a, b)=$

  • A
    $(2, -1)$
  • B
    $\left(2, -\frac{1}{2}\right)$
  • C
    $(-1, 2)$
  • D
    $\left(-\frac{1}{2}, 2\right)$

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