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The straight lines whose direction cosines are given by `al + bm + cn = 0`,` fmn + gnl +hlm=0`are perpendicular if

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The straight lines whose direction cosines are given by `al + bm + cn = 0`,` fmn + gnl +hlm=0`are perpendicular if
A. `(f)/(a)+(g)/(b)+(h)/(c )=1`
B. `(f)/(a)+(g)/(b)+(h)/(c )=-1`
C. `(f)/(a)+(g)/(b)+(h)/(c )=0`
D. `(a)/(f)+(b)/(g)+(c )/(h)=0`
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Correct Answer - C
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