What is the standard form of the equation of the circle in the graph?

(x - 3)2 + (y + 1)2 = 1

(x + 3)2 + (y - 1)2 = 1

(x - 3)2 + (y + 1)2 = 2

(x + 3)2 + (y - 1)2 = 2

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