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What is the equation of the locus of a p...

What is the equation of the locus of a point which moves such that 4 times its distance from the x-axis is the square of its distance from the origin

A

`x^2 + y^2 -4y = 0`

B

`x^2 + y^2 - 4 = 0`

C

`x^2 + y^2 - 4x = 0`

D

`x^2 + y^2 -4x = 0`

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