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Evaluate, underset(xto1)"lim"(x^(4)-1)/(...

Evaluate, `underset(xto1)"lim"(x^(4)-1)/(x-1)= underset(xtok)"lim"(x^(3)-k^(3))/(x^(2)-k^(2))` , then find the value of k.

A

`(-8)/(3)`

B

`(5)/(3)`

C

`-(5)/(3)`

D

None of these

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The correct Answer is:
D
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