The circles x^2 + y^2 - 4x - 81 =0 and x...

The circles `x^2 + y^2 - 4x - 81 =0 and x^2 + y^2 + 24x - 81=0` intersect each other at `A and B`. The equation of the circle with `AB` as the diameter is : (A) `x^2 + y^2 = 81` (B) `x^2 + y^2 = 9` (C) `x^2 + y^2 = 16` (D) `x^2 + y^2 = 1`

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