Which of the following constraints represents the assignment for student A?
A) XA1 + XA2 + XA3 + XA4 = 0
B) XA1 + XA2 + XA3 + XA4 = 1
C) XA1 + XA2 + XA3 + XA4 ? 1
D) XA1 + XA2 + XA3 + XA4 ? 0
Answer: B
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