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If f(x)=(x^2-1)/(x^2+1) . For every real...

If `f(x)=(x^2-1)/(x^2+1)` . For every real number `x ,` then the minimum value of `fdot` does not exist because `f` is unbounded is not attained even through `f` is bounded is equal to 1 is equal to `-1`

A

does not exist because f is unbounded

B

is not attained even through f is bounded

C

is equal to 1

D

is equal to -1

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The correct Answer is:
D
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