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The condition for the lines with directi...

The condition for the lines with direction ratio `a_1,b_1,c_1` and `a_2,b_2,c_2` are perpendicular is -

A

`a_1a_2+b_1b_2+c_1c_2`=0

B

`a_1a_2+a_2b_1+c_1c_2`=0

C

`a_1=a_2,b_1=b_2,c_1=c_2`

D

`(a_1)/(a_2)=b_1/b_2=c_1/c_2`

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