Explanation
Hence, Option (D) is the correct answer.
The radius of circel x^2+y^2-6x-8y=0 is \sqrt{g^2+f^2-c}
Here g=-3,f=-4,c=0\implies r=\sqrt{(-3)^2+(-4)^2}\\\sqrt{9+16}=\sqrt {25}=5
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