The square of the length of the tangent drawn from the point $(\alpha, \beta)$ to the circle $ax^2 + ay^2 = r^2$ is
- A$a\alpha^2 + a\beta^2 - r^2$
- B$\alpha^2 + \beta^2 - \frac{r^2}{a}$
- C$\alpha^2 + \beta^2 + \frac{r^2}{a}$
- D$\alpha^2 + \beta^2 - r^2$
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