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If the line lx+my+n=0 is tangent to the ...

If the line `lx+my+n=0` is tangent to the circle `x^(2)+y^(2)=a^(2)` , then find the condition.

A

`l^(2) + m^(2) = n^(2) r^(2)`

B

`l^(2) + m^(2) = n^(2) + r^(2)`

C

`n^(2) = r^(2)(l^(2) + m^(2))`

D

none of these

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