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If the lines x=a(1)y + b(1), z=c(1)y +d(...

If the lines `x=a_(1)y + b_(1), z=c_(1)y +d_(1)` and `x=a_(2)y +b_(2), z=c_(2)y + d_(2)` are perpendicular, then

A

`ac _(1) + a_(1) c =1`

B

` a a _(1) + c c_(1) + 1=0`

C

` bc _(1) + b_(1) c + 1=0`

D

None of these

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The correct Answer is:
B
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