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Let S1, S2 and S3 be three sets defined as

\(S_1=\{z \in \mathbb C:|z-1|\leq \sqrt{2}\}\)

\(S_2=\{z \in \mathbb C:\text{Re} \big((1-i)z\big)\geq 1\}\)

\(S_3=\{z \in \mathbb C:\text{Im}(z)\leq 1\}\)

Then the set \(S_1\cap S_2\cap S_3\)

(1) Is a singleton

(2) Has exactly two elements

(3) Has infinitely many elements

(4) Has exactly three elements

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