C(1) and C(2) are two concentric circles...

`C_(1) and C_(2)` are two concentric circles with centres at O. Their radii are 12 cm and 3 cm respectively. B and C are the points of contact of two tangents draw to `C_(2)` from a point A lying on the circle `C_(1)`. Then the area of the quadrilateral ABOC is-

`(9sqrt(15))/(2)` sq. cm

`12sqrt(15)` sq. cm

`9sqrt(15)` cm

`6sqrt(15)` sq. cm

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