If \( f(x)=\frac{x^{2}-1}{x^{2}+1} \), for every real \( x \), then...

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If \( f(x)=\frac{x^{2}-1}{x^{2}+1} \), for every real \( x \), then the minimum value of \( f \)
\( \mathrm{P} \)
(A) does not exist because \( f \) is unbounded
W
(B) is not attained even through \( \mathrm{f} \) is bounded
(C) is equal to 1
(D) is equal to \( -1 \)
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