The equation of the circle $$O_1$$ is $$x^2+y^2=4$$. The equation for $$O_2$$ is $$(x-a)^2+(y-b)^2 = 4$$. a and b are constants.$$a^2+b^2 = 4$$ . The two circles intersect on line l What is the equation of the line?
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Aax+by=0
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Bax-by=0
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Cax+by=2
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Dax-by=2
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Ebx+ay=2
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正确答案: C