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If f(x)=(x^(2)+2alphax+alpha^(2)-1)^(1//...

If `f(x)=(x^(2)+2alphax+alpha^(2)-1)^(1//4)` has its domain and range such that their union is set of real numbers, then `alpha` satisfies

A

`-1 lt alpha lt 1`

B

`alpha le -1`

C

`alpha ge 1`

D

`alpha le 1`

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The correct Answer is:
B
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