A linear program has been solved and sensitivity analysis has been performed. The ranges for the objective function coefficients have been found. For the profit on, the upper bound is 100, the lower bound is 75, and the current value is 80. If the profit on is increased to 120, then:
a) the values for all of the decision variables will remain the same.
b) other values will change, but the original corner point remains optimal.
c) a new corner point will become optimal.
d) none of the above.