Let a, b and c be any real numbers. Suppose that there are real numbers x

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Let a, b and c be any real numbers. Suppose that there are real numbers x, y, z not all zero such that x = cy + bz, y = az + cx and z = bx + ay. Then, a2 + b2 + c2 + 2 abc is equal to

A:1

B:2

C:–1

D:0
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