A set of parallel chords of the parabola...

A set of parallel chords of the parabola `y^2=4a x` have their midpoint on any straight line through the vertex any straight line through the focus a straight line parallel to the axis another parabola

A

any straight line through the vertex

B

any straight line through the focus

C

a straight line parallel to the axis

D

another parabola

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The correct Answer is:

C

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