The projections of the segment PQ on the...

The projections of the segment PQ on the coordinate axes are -9,12,-8 respectively. The direction cosines of the line PQ are (A) `-9/sqrt(17),12/sqrt(17),-8/sqrt(17)` (B) `-9/288,12/289,-8/289` (C) `-9/17,12/17,-8/17` (D) none of these

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