If z is a complex number, then \[z.\,\overline{z}=0\] if and only

1.	If z is a complex number, then \[z.\,\overline{z}=0\] if and only if
A.	\[z=0\]
B.	\[\operatorname{Re}(z)=0\]
C.	\[\operatorname{Im}\,(z)=0\]
D.	None of these
Answer» B. \[\operatorname{Re}(z)=0\]

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If z is a complex number, then \[z.\,\overline{z}=0\] if and only if

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