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If \( P_{1} Q_{1} \) and \( P_{2} Q_{2} \) are two focal chords of the parabola \( y^{2}=4 \) ax. then the chords \( P_{1} P_{2} \) and \( Q_{1} Q_{2} \)
\( \mathrm{P} \) intersect on

W
(A) tangent at the vertex of the parabola
(B) the directrix of the parabola
(C) at \( x=-2 a \)
(D) \( y=2 a \) and \( x=-2 a \)
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