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Let A = {z ∈ C : 1 ≤ |z – (1 + i)| ≤ 2} and B = {z ∈ A : |z – (1 – i)| = 1}. Then, B :

1. Is an empty set
2. Contains exactly two elements
3. Contains exactly three elements
4. Is an infinite set

Correct answer: Is an infinite set

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