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A parabola with latusrectum 8 touches a ...

A parabola with latusrectum 8 touches a fixed equal parabola. The axes of two parabola are parallel then the locus of the vertex of moving parabola is
A) a circle with radius 4
B) a parabola
C) a conic with latusrectum 16
D) a circle with centre at vertex of parabola

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