After a dilation centered at the origin, the image of AB¯¯¯¯¯¯¯¯ is A′B′¯¯¯¯¯¯¯¯¯¯. If the coordinates of the endpoints of these segments are A(6, −4), B(2, −8), A′(9, −6), and B′(3, −12), what is the scale factor of the dilation?

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A: Please refer to the image below

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