The radical centre of the circles x^(2)+...

The radical centre of the circles `x^(2)+y^(2)=9`,`x^(2)+y^(2)-2x-2y-5=0`,`x^(2)+y^(2)+4x+6y-19=0` is
A) (0,0) (B) (1,1) (C) (2,2) (D) (3,3)

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