Question: In a binary integer programming model, the constraint (x1 + x2 + x3 + x4 = 3) means that: the first three options must be

In a binary integer programming model, the constraint (x1 + x2 + x3 + x4 = 3) means that:

the first three options must be selected but not the fourth one

at least three options need to be selected

exactly 1 out of 4 will be selected

exactly three options should be selected Which of the following best describes the constraint: both A and B?

B - A = 0

B - A 0

B + A = 1

B + A 1

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