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If 3x + 4y = 12 2 is a tangent to the ellipse 9 y a x 2 2 2 + = 1 for some a ∈ R, then the distance between the foci of the ellipse is:

1. 4
2. 2 2
3. 2 5
4. 2 7

Correct answer: 2 7

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