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Select and write the correct answer from the given alternatives in each of the following: If `alpha`, `beta` are non-real cube roots of unity, then which one of the following statements is incorrect:

A

a) `alpha^2 = beta`

B

b) `beta^2 = alpha`

C

c) `alpha = (1 / beta)`

D

d) `alpha beta^2 = 1`

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