$A(z_1)$ and $B(z_2)$ are two points in the Argand plane. Then,the locus of the complex number $z$ satisfying $\arg \left(\frac{z-z_1}{z-z_2}\right)=0$ or $\pi$ is

  • A
    the circle with $\overline{AB}$ as a diameter
  • B
    the ellipse with $A, B$ as extremities of the major axis
  • C
    the perpendicular bisector of $\overline{AB}$
  • D
    the straight line passing through the points $A$ and $B$

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