Which of the following is equal to z1+z2ˉ\bar{z_1 + z_2}z1+z2ˉ?
z1ˉ+z2\bar{z_1} + z_2z1ˉ+z2
z1ˉ+z2ˉ\bar{z_1} + \bar{z_2}z1ˉ+z2ˉ
z1ˉ⋅z2ˉ\bar{z_1} \cdot \bar{z_2}z1ˉ⋅z2ˉ
∣z1∣+∣z2∣|z_1| + |z_2|∣z1∣+∣z2∣