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Q.) If ( alpha ) and ( beta ) are the roots of the equation ( x^2 + px + q = 0 ), and ( alpha )^4 and ( beta) ^4 are the roots of ( x^2 - rx + q = 0 ), then the roots of ( x^2 - 4qx + 2q^2 -r = 0 ) are always:
[A]both non-real
[B]both positive
[C]both negative
[D]opposite in sign