If (xy)^((a - 1)) = z, (yz)^((b - 1)) =...

If `(xy)^((a - 1)) = z, (yz)^((b - 1)) = x and (xz)^((c-1)) = y, and xyz` is not ` -1, 0 or 1`, then which of the following is equal to `ab + bc + ca?`

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