In a linear programming problem, the objective function was specified as follows: Z=5X+3Y+6Z The optimal solution calls for X to equal 4,Y to equal 6 , and Z to equal 3 . It has also been determined that the coefficient associated with X can range from 3.75 to 6.25 without the optimal solution changing. This range is called the: Multiple Choice ranpe of optimality ronge of feosibility risk factor range of optimality range of feasibility risk-factor constraints parameters