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A tetrahedron has vertices $P(1, 2, 1)$, $Q(2, 1, 3)$, $R(-1, 1, 2)$ and $O(0, 0, 0)$. The angle between the faces $OPQ$ and $PQR$ is:
(1) $\cos^{-1}\left(\frac{17}{31}\right)$
(2) $\cos^{-1}\left(\frac{19}{35}\right)$
(3) $\cos^{-1}\left(\frac{9}{35}\right)$
(4) $\cos^{-1}\left(\frac{7}{31}\right)$
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