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For complex numbers, which relation is NOT defined?

Az₁ < z₂ (order)
Bz₁ + z₂
C|z₁|
Dz₁ · z₂
Answer & Solution
Correct answer: A. z₁ < z₂ (order)
Order relations ('less than'/'greater than') are not defined on complex numbers arithmetic and modulus are.
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