A plane passes through the points A(1,2,...

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 `vec(OP)` on the plane is of length :

A

`sqrt(2/7)`

B

`sqrt(2/3)`

C

`sqrt(2/11)`

D

`sqrt(2/5)`

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The correct Answer is:

C

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