यदि $\cos^{-1} p + \cos^{-1} q + \cos^{-1} r = \pi$ है,तो $p^2 + q^2 + r^2 + 2pqr = $

  • A
    $3$
  • B
    $1$
  • C
    $2$
  • D
    $-1$

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