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The length of the common chord of the ci...

The length of the common chord of the circles ` (x - a)^(2) + (y - b)^(2) =c^2" and " (x -b)^(2) + (y -a)^(2) = c^(2) = c^(2)` is

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If a!=b then the length of common chord of the circles (x-a)^(2)+(y-b)^(2)=c^(2) and (x-b)^(2)+(y-a)^(2)=c^(2) is (A)sqrt(4c^(2)-2(a-b)^(2))(B)sqrt(c^(2)-(a-b)^(2))(C)sqrt(3c^(2)-(a-b)^(2))(D)sqrt(2c^(2)(a-b)^(2))(C)