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If the line lx+my+n=0 intersects the cur...

If the line `lx+my+n=0` intersects the curve `ax^(2)+2hxy+by^(2)=1` at P and Q such that the circle with PQ as a diameter passes through the origin, then `l^(2)+m^(2)=`

A

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

B

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

C

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

D

none of these

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A
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