In a BIP Problem with 3 Mutually Exclusive Alternatives, X1

Multiple Choice

In a BIP problem with 3 mutually exclusive alternatives, x1, x2, and x3, the following constraint needs to be added to the formulation:

A) x1 + x2 + x3 ≤ 1.
B) x1 + x2 + x3 = 1.
C) x1 - x2 - x3 ≤ 1.
D) x1 - x2 - x3 = 1.
E) None of the choices is correct.