\( A B \) is a chord of the parabola \( y^{2}=4 a x \) with vertex ...

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\( A B \) is a chord of the parabola \( y^{2}=4 a x \) with vertex \( A \).
\( \mathrm{P} \) \( B C \) is drawn perpendicular to \( A B \) meeting the axis at

W \( C \). The projection of \( \mathrm{BC} \) on the axis of the parabola is:
(1) \( a \)
(2) \( 2 a \)
(3) \( 4 a \)
(4) \( 8 a \)
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