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The lines a(1)x+b(1)y+c(1)=0 and a(2)x+b...

The lines `a_(1)x+b_(1)y+c_(1)=0` and `a_(2)x+b_(2)y+c_(2)=0` are perpendicular to each other if

A

`a_1b_2= a_2 b_1`

B

`a_1a_2= b_1 b_2`

C

`a_1a_2+ b_1 b_2=0`

D

`a_1b_2+ a_2 b_1=0` .

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