Which of the following represents the associative property for complex numbers?

(z1 + z2) + z3 = z1 + (z2 + z3)

(z1 + z2) + z3 = z3 + (z2 + z1)

z1 + (z2 - z3) = z1 + z2 - z3

z1 + z2 = z2 + z3

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