If the segment intercepted by the parabola \( y^{2}=4 a x \) P with...

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If the segment intercepted by the parabola \( y^{2}=4 a x \)
P with the line \( l x+m y+n=0 \) subtends a right angle

W at the vertex, then:
(1) \( 4 a l+n=0 \)
(2) \( 4 a l+4 a m+n=0 \)
(3) \( 4 a m+n=0 \)
(4) \( a l+n=0 \)
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