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The line L x+m y+n=0 is a normal to the ...

The line L x+m y+n=0 is a normal to the ellipse `(x^(2))/(a^(2))+(y^(2))/(b^(2))=1`, if

A

`(a^(2))/(m^(2))+(b^(2))/(l^(2))=((a^(2)-b^(2))^(2))/(n^(2))`

B

`(a^(2))/(l^(2))+(b^(2))/(m^(2))=((a^(2)-b^(2))^(2))/(ldots^(2))`

C

`(a^(2))/(l^(2))-(b^(2))/(m^(2))=((a^(2)-b^(2))^(2))/(n^(2))`

D

none of these

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The correct Answer is:
B
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