Which of the following is assumed when considering the linearity feature of linear programming (LP) models?
a. The contribution of decision variables to the objective function is proportional.
b. The contribution of each decision variable can be added to obtain the overall usage of a given constraint.
c. The contribution of each decision variable can be added to obtain the overall value of the objective function.
d. All of the above are features of proportionality in LP.
A
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