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Q.) Locus of the feet of the perpendiculars drawn from either focus on a variable tangent to the hyperbola 16y^2- 9x^2= 1 is
[A]x^2+y²-9
[B]x^2+y^2=1/9
[C]x^2+y^2=7/ 144
[D]x^2+y^2=1/16