यदि $\cos^{-1} x + \cos^{-1} y + \cos^{-1} z = \pi$ है,तो

  • A
    $x^2 + y^2 + z^2 + xyz = 0$
  • B
    $x^2 + y^2 + z^2 + 2xyz = 0$
  • C
    $x^2 + y^2 + z^2 + xyz = 1$
  • D
    $x^2 + y^2 + z^2 + 2xyz = 1$

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