The length of the tangent from a point $P(x_1, y_1)$ to the circle $x^2 + y^2 + 2gx + 2fy + c = 0$ is given by:
- A$\sqrt{x_1^2 + y_1^2 + 2gx_1 + 2fy_1 + c}$
- B$\sqrt{x_1^2 + y_1^2}$
- C$\sqrt{(x_1 + g)^2 + (y_1 + f)^2}$
- DNone of these
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