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Let `P_1` and `P_2` be two fixed points in xy- plane. A line `L_1=0` passes through `P_1` intersects y-axis at B and the line `L_2=0` passes through `P_2` and intersects x-axis at A. If `L_1=0` and `L_2=0` are perpendicular then the locus of mid-point of AB is-
A. |
Straight line |
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B. |
Circle |
C. |
Ellipse |
D. |
Parabola |