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Direction cosines of a line which passes...

Direction cosines of a line which passes through the points `(1,2,3)` and `(-3,4,1)` is
A) `(4/(2sqrt6), -2/(2sqrt6), 2/(2sqrt6))`
B) `(4/(2sqrt6), -2/(2sqrt6), -2/(2sqrt6))`
C) `(4/(2sqrt6), 4/(2sqrt6), 2/(2sqrt6))`
D) `(-4/(2sqrt6), 1/(2sqrt6), -2/(2sqrt6))`

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