If $x_1$ and $x_2$ are the real roots of the equation $x^2-kx+c=0$,then the distance between the points $A(x_1, 0)$ and $B(x_2, 0)$ is
- A$\sqrt{k^2+4c}$
- B$\sqrt{k^2-c}$
- C$\sqrt{c-k^2}$
- D$\sqrt{k^2-4c}$
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