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An ellipse is drawn with major and minor...

An ellipse is drawn with major and minor axis of length ` 10` and `8` respectively. Using one focus a centre, a circle is drawn that is tangent to ellipse, with no part of the circle being outside the ellipse. The radius of the circle is (A) `sqrt3` (B) `2` (C) `2sqrt2` (D) `sqrt5`

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