If the tangent to the curve $\frac{x^2}{a^2} + \frac{y^2}{b^2} = 1$ is parallel to the $x$-axis,then what is the point of tangency?

  • A
    $(a, 0)$
  • B
    $(0, -b)$
  • C
    $(0, \pm b)$
  • D
    $(\pm a, 0)$

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