If $f$ is defined in $[1,3]$ by $f(x)=x^3+b x^2+a x$,such that $f(1)-f(3)=0$ and $f^{\prime}(c)=0$,where $c=2+\frac{1}{\sqrt{3}}$,then $(a, b)$ is equal to

  • A
    $(-6,11)$
  • B
    $(2 - \frac{1}{\sqrt{3}},2 + \frac{1}{\sqrt{3}})$
  • C
    $(11,-6)$
  • D
    $(6,11)$

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