The points $z_1, z_2, z_3, z_4$ in the complex plane are the vertices of a parallelogram taken in order,if and only if
- A$z_1 + z_4 = z_2 + z_3$
- B$z_1 + z_3 = z_2 + z_4$
- C$z_1 + z_2 = z_3 + z_4$
- DNone of these
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