If $x = cy + bz$,$y = az + cx$,$z = bx + ay$ (where $x, y, z$ are not all zero) have a solution other than $x = 0, y = 0, z = 0$,then $a, b$,and $c$ are connected by the relation:

  • A
    $a^2 + b^2 + c^2 + 3abc = 0$
  • B
    $a^2 + b^2 + c^2 + 2abc = 0$
  • C
    $a^2 + b^2 + c^2 + 2abc = 1$
  • D
    $a^2 + b^2 + c^2 - bc - ca - ab = 1$

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