The common chord of the circle x^2+y^2+6...

The common chord of the circle `x^2+y^2+6x+8y-7=0` and a circle passing through the origin and touching the line `y=x` always passes through the point. (a) `(-1/2,1/2)` (b) (1, 1) (c) `(1/2,1/2)` (d) none of these

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