If $\frac{d}{d x}\left(\frac{1+x^2+x^4}{1+x+x^2}\right)=a x+b$,then $(a, b)=$

  • A
    $(-1, 2)$
  • B
    $(-2, 1)$
  • C
    $(2, -1)$
  • D
    $(1, 2)$

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