Could you please do this question with explanation

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Let X, Y, and Z denote whether or not to build a factory in Canada, USA, and Mexico, respectively. Suppose that X, Y, and Z are binary variables. If we only want to select one country from these three countries. Which of the following constraints can be used? X + Y + Zs1 O X + y + z = 1 X + Y + Z2 1 O None of the above