The locus of the point of intersection of two perpendicular tangents to the ellipse $\frac{x^2}{9} + \frac{y^2}{4} = 1$ is:
- A$x^2 + y^2 = 4$
- B$x^2 + y^2 = 9$
- C$x^2 + y^2 = 13$
- D$x^2 + y^2 = 5$
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