The equation of the circle which passes through the origin and the points (2, 0) and (0, -4) is:
x² + y² - 2x - 4y = 0.
x² + y² - 2x + 4y = 0.
x² + y² + 2x + 4y = 0.
x² + y² + 2x - 4y = 0.
