3x + 4y = 12 sqrt2 is the tangent to the...

`3x + 4y = 12 sqrt2` is the tangent to the ellipse `x^2/a^2 + y^2/9 = 1` then the distance between focii of ellipse is-

`2sqrt(7)`

`2sqrt(5)`

`2sqrt(2)`

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`A`

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