The centroid of the triangle whose vertices are $P(1, -2, 1)$,$Q(2, 3, -1)$,and $R(1, -1, -1)$ is:

  • A
    $(1, 2, 1)$
  • B
    $(\frac{4}{3}, 0, -\frac{1}{3})$
  • C
    $(\frac{3}{2}, \frac{1}{2}, 0)$
  • D
    $(-\frac{4}{3}, -\frac{4}{3}, -\frac{1}{3})$

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