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For all numbers a and b, the operation is defined by a ⊕ b = $$a^2 - ab$$. If xy ≠ 0, then which of the following can be equal to zero?
I. x ⊕ y
II. xy ⊕ y
III. x ⊕ (x + y)
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AII only
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BI and II only
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CI and III only
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DII and III only
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EAll of the above
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