Q 2166134075.     The straight lines whose direction cosines are given by

`al + bm + cn = 0, f m n + gnl + hlm = 0` are perpendicular if

A

`f/a + g/b + h/c =0`

B

`a^2/f + b^2/g + c^2/ h =0`

C

`a^2 (g+h) + b^2 (h+f) + c^2 (f+g) = 0`

D

none of the above

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