Let $a, b \in \mathbb{R}$ and the roots $\alpha, \beta$ of the equation $z^2+az+b=0$ be complex. If the origin,$\alpha$ and $\beta$ represent the vertices of an equilateral triangle on the Argand plane,then

  • A
    $a=b$
  • B
    $a^2=3b$
  • C
    $a^2=4b$
  • D
    $a=3b$

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