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 is the point of contact of tangents drawn to `C_(2)` from a point A lying on the circle `C_(1)`. Then the area of the triangle OAB is :

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

`12 sqrt(15)` sq. cm

`9 sqrt(15)` sq. cm

`6 sqrt(15)` sq. cm

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