If x = 997, y = 998 and z = 999 then the value of x2 + y2 + z2 - xy - yz - zx is? Options: A . &nbsp0 B . &nbsp1 C . &nbsp-1 D . &nbsp3

If x = 997, y = 998 and z = 999 then the value of x2 + y2 + z2 - xy - yz

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