If alpha,beta are the roots of 1+x+x^2=0...

If alpha,beta are the roots of `1+x+x^2=0` then the value of `(alpha)^4+(beta)^4+(alpha)^-4(beta)^-4 = `

A

`A.0`

B

`B.1`

C

`C.-1`

D

`D.2`

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