Find the points on the curve $\frac{x^2}{4} + \frac{y^2}{25} = 1$ at which the tangents are parallel to the $x$-axis.

  • A
    $(0, \pm 3)$
  • B
    $(0, \pm 1)$
  • C
    $(0, \pm 5)$
  • D
    $(0, \pm 2)$

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