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A plane passes through the points $A(1, 2, 3)$, $B(2, 3, 1)$ and $C(2, 4, 2)$. If $O$ is the origin and $P$ is $(2, -1, 1)$, then the projection of $\overrightarrow{OP}$ on this plane is of length:
(1) $\sqrt{\frac{2}{5}}$
(2) $\sqrt{\frac{2}{3}}$
(3) $\sqrt{\frac{2}{11}}$
(4) $\sqrt{\frac{2}{7}}$
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