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If two tangents drawn from the point P (h,k) to the parabola `y^2=8x` are such that the slope of one of the tangent is 3 times the slope of the other , then the locus of point P is

A

`3y^2=16x`

B

`3y^2=8x`

C

`y^2=32x`

D

`3y^2=32x`

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The correct Answer is:
D
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