The slope of the normal to the circle $x^2+y^2+2gx+2fy+c=0$ at $(x_1, y_1)$ is
- A$-\frac{x_1+g}{y_1+f}$
- B$-\frac{y_1+f}{x_1+g}$
- C$\frac{x_1+g}{y_1+f}$
- D$\frac{y_1+f}{x_1+g}$
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