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Let \( I \) denote the set of values of \( m \) for which \( y=m x \) \( -\frac{\left(a^{2}-b^{2}\right) m}{\sqrt{b^{2} m^{2}+a^{2}}} \) is normal to the ellipse \( \frac{x^{2}}{a^{2}}+\frac{y^{2}}{b^{2}}= \) 1, then \( I \) equals
(a) \( (-\infty, \mathrm{O}) \)
(b) \( (\mathrm{O}, \infty) \)
(c) \( (-\infty, \infty) \)
(d) \( \left(\frac{-\pi}{2}, \frac{\pi}{2}\right) \)
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