A) An unbounded problem is one for which the objective can be increased or decreased to infinity or negative infinity while the solution remains feasible.
B) If a model has alternative optimal solutions the objective is maximized (or minimized) by more than one combination of decision variables, all of which have the same objective function value.
In mathematics, a function from a set X to a set Y assigns to each element of X exactly one element of Y. The set X is called the domain of the function and the set Y is called the codomain of the function.
C) The shadow price indicates how much the value of the objective function will change as the right-hand side of a constraint is increased by 1.
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