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The two lines a x+b y=c and a^(prime) x+...

The two lines `a x+b y=c` and `a^(prime) x+b^(prime) y=c^(')` are perpendicular if

A

`a a^(prime)+b b^(prime)=0`

B

`a b^(prime)=b a^(prime)`

C

`a b+a^(prime) b^(r)=0`

D

`a b^(prime)+b a^(prime)=0`

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The correct Answer is:
A
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