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An ellipse E,(x^(2))/(a^(2))+(y^(2))/(b^...

An ellipse `E,(x^(2))/(a^(2))+(y^(2))/(b^(2))=1`, centred at point O has AB and CD as its major and minor axes, respectively. Let `S_(1)` be one of the foci of the ellipse, the radius of the incircle of traingle `OCS_(1)` be 1 unit, adn `OS_(1)=6` units
The perimeter of `DeltaOCS_(1)` is

A

10

B

15

C

20

D

25

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A, B, C
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