Let $a, b, c$ be non-zero real numbers such that $a+b+c=0$. Let $q=a^2+b^2+c^2$ and $r=a^4+b^4+c^4$. Then,

  • A
    $q^2 < 2r$ always
  • B
    $q^2 = 2r$ always
  • C
    $q^2 > 2r$ always
  • D
    $q^2 - 2r$ can take both positive and negative values

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