If \( y=\log \left(\frac{1-x^{2}}{1+x^{2}}\right) \), then \( \frac...

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If \( y=\log \left(\frac{1-x^{2}}{1+x^{2}}\right) \), then \( \frac{d y}{d x} \) is equal to
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(A) \( \frac{4 x^{3}}{1-x^{4}} \)
(B) \( \frac{-4 x}{1-x^{4}} \)
(C) \( \frac{1}{4-x^{4}} \)
(D) \( \frac{-4 x^{3}}{1-x^{4}} \)
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