The square of the perpendicular distance...

The square of the perpendicular distance of apoint `P (p, q, r)` from a line through `A(a, b, c)` and whose direction cosine are `l, m, n` is (A) `sum{(q-b)n-(r-c)m}^2` (B) `sum{(q+b)n-(r+c)m}^2` (C) `sum{(q-b)n+(r-c)m}^2` (D) none of these

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