If zzz is a purely imaginary number, which of the following must be true?
z=zˉz = \bar{z}z=zˉ
z+zˉ=0z + \bar{z} = 0z+zˉ=0
∣z∣=0|z| = 0∣z∣=0
z−zˉ=0z - \bar{z} = 0z−zˉ=0