If $P + Q = R$ and $| P |=| Q |=\sqrt{3}$ and $| R |=3$, then the angle between $P$ and $Q$ is

  • A
    $\pi / 4$
  • B
    $\pi / 6$
  • C
    $\pi / 3$
  • D
    $\pi / 2$

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