(a) When you solve an integer programming problem (suppose it is a maximization prob- lem), how do you obtain an upper bound on the optimal objective value? How do you obtain a lower bound? (b) Suppose you use a binary variable yA to represent whether or not event A will happen, and use a binary variable yYB to represent whether or not event B will happen. How do you model the following logic constraint using an inequality? If A happens → then B must happen

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