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AB is a chord of a parabola y^(2)= 4ax, ...

AB is a chord of a parabola `y^(2)= 4ax, (a gt 0)` with vertex A. BC is drawn perpendicular to AB meeting the axis at C. The projection of BC on the axis of the parabola is

A

a unit

B

2a unit

C

8a unit

D

4a unit

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