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P(1,0,-1),Q(2,0,-3),R(-1,2,0) and S(3,-2...

`P(1,0,-1),Q(2,0,-3),R(-1,2,0) and S(3,-2,-1)` are four points and d is the projection of `vec(PQ) on vec(RS)` then which of the following is (are) true? (A) `d=6/sqrt(165)` (B) `d= 6/sqrt(33)` (C) `8/sqrt(33)` (D) `d=6/sqrt(5)`

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