If the circumference of the circle x^2 +...

If the circumference of the circle `x^2 + y^2 + 8x + 8y - b = 0` is bisected by the circle `x^2 + y^2 - 2x + 4y + a = 0` then `a+b=` (A) 50 (B) 56 (C) `-56` (D) `-34`

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