Which of the Following Statements Is Not Correct

Multiple Choice

Which of the following statements is not correct?

A) A function with multiple variables can be linear.
B) If a constraint is violated, then the problem is infeasible.
C) A Linear Program as described in Supplement B can have more than one objective function if it has only one constraint.
D) Non-negativity constraints should be added to Linear Programs when the decision variable represents units of production.
E) An unbounded solution to a mathematical program may occur if there is not a constraint stopping the objective function value from continuing towards -∞.