In the ellipse $\frac{x^2}{a^2} + \frac{y^2}{b^2} = 1$,the equation of the diameter conjugate to the diameter $y = \frac{b}{a}x$ is:

  • A
    $y = - \frac{b}{a}x$
  • B
    $y = - \frac{a}{b}x$
  • C
    $x = - \frac{b}{a}y$
  • D
    None of these

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