Find the equation of the circle with its center at (2, -1) and a radius of 4.
(x - 2)² + (y + 1)² = 16
(x - 2)² - (y + 1)² = 4
4(x - 2)² + 4(y + 1)² = 16
(x - 4)² + (y + 1)² = 4

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