The line $lx + my + n = 0$ is normal to the circle ${x^2} + {y^2} + 2gx + 2fy + c = 0$, if
The line $lx + my + n = 0$ is normal to the circle ${x^2} + {y^2} + 2gx + 2fy + c = 0$, if
- A
$lg + mf - n = 0$
- B
$lg + mf + n = 0$
- C
$lg = mf - n = 0$
- D
$lg - mf + n = 0$
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