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If the circles `x^2+y^2-2x-2y+7=0` and `x^2+y^2+4x+2y+k=0` cut orthogonally, then the length of the common chord of the circles is `a.(12)/(sqrt(13))`

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If the circles `x^2+y^2-2x-2y+7=0` and `x^2+y^2+4x+2y+k=0` cut orthogonally, then the length of the common chord of the circles is `a.(12)/(sqrt(13))` b. 2 c. 5 d. 8
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Correct Answer - (a)
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