in a linear programming problem, the objective function was specified as follows:

$/-5$X $-37+67$

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 $3\mathrm{.}75$ to $6\mathrm{.}25$ without the optimal solution changing. This range is called the:

Multiple Choice

$1$ constraints

$2$ risk factor

$3$ parameters

$4$ range of optimality

$5$ range of feasibility