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If the line ax+by+c=0 is normal to the h...

If the line `ax+by+c=0` is normal to the hyperbola `xy=1`, then

A

`a gt 0 , b gt 0`

B

`a gt 0 , b gt 0`

C

`a gt 0 , b =0`

D

`a lt 0 , b lt 0`

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