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If S={z in c: 1 le abs(z-(1+i)) le 2} an...

If `S={z in c: 1 le abs(z-(1+i)) le 2}` and `A={z in s: abs(z-(1-i))=1}` then A is

A

is an empty set

B

contains exactly two elements

C

contains exactly three elements

D

is an infinite set

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