The region of the complex plane for which \[\left| \frac{z-a}{z+\overline{a}} \right|=1\,\] \[\,[R(a)\ne 0]\] is

The region of the complex plane for which \[\left| \frac{z-a}{z+\overl

1.	The region of the complex plane for which \[\left\| \frac{z-a}{z+\overline{a}} \right\|=1\,\] \[\,[R(a)\ne 0]\] is
A.	\[x-\]axis
B.	\[y-\]axis
C.	The straight line \[x=a\]
D.	None of these
Answer» C. The straight line \[x=a\]