The locus of the point from which the le...

The locus of the point from which the lengths of the tangents to the circles `x^2+y^2=4` and `2(x^2+y^2)-10 x+3y-2=0` are equal to (a) a straight line inclined at `pi/4` with the line joining the centers of the circles (b) a circle (c) an ellipse (d)a straight line perpendicular to the line joining the centers of the circles.

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