Let $P(6, 3)$ be a point on the hyperbola $\frac{x^2}{a^2} - \frac{y^2}{b^2} = 1$. If the normal at point $P$ intersects the $x$-axis at $(9, 0)$,then the eccentricity of the hyperbola is:

  • A
    $\sqrt{\frac{5}{2}}$
  • B
    $\sqrt{\frac{3}{2}}$
  • C
    $\sqrt{2}$
  • D
    $\sqrt{3}$

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