$S=\{z \in C /|z+1-i|=1\}$ represents
- Athe circle with centre at $(-1,1)$ and radius 1 unit
- Bthe circle with cente at $(1,-1)$ and radius 1 unit
- Cthe closed circular disc with centre at $(1,-1)$ and radius 1 unt
- Dthe closed circular disc with centre at( $-1,1$ ) and radius 1 unt
✓ Correct answer: A
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