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

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

A

`a gt 0,b gt 0`

B

`b gt 0,a lt 0`

C

`a lt 0, b lt 0`

D

`b!=0,a!=0`

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The correct Answer is:

B

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