P is parabola y^2=4ax and locus of mid p...

P is parabola `y^2=4ax` and locus of mid points of all chords of this parabola passing through the vertex of P is a parabola P'. Axis of parabola P' will be

A

`(y^2-4ax)(y^2+4a^2)=4a^2c^2`

B

`(y^2-4ax)=4a^2c^2`

C

`(y^2-4ay)=4a^2c^2`

D

None of these

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The correct Answer is:

A

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