If (1 + i sqrt(3))/(2) is a root of ...

If ` (1 + i sqrt(3))/(2)` is a root of the equation `x^4-x^3 +x-1=0` then its real roots are

A

`1,1`

B

`-1,-1`

C

`1,2`

D

`1,-1`

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The correct Answer is:

D

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