During our in$-$class exercise on the optimization model for a pharmaceutical company's production material assignment using Excel Solver, we observed that constraints play a critical role in guiding the solution towards feasibility and profitability. Based on our in$-$class activity, which example below accurately reflects the function of constraints in the context of maximizing profit?

A$.$ Constraints exclusively manage the allocation of the limited budget to ensure costeffective advertisement across media channels.

B$.$ Constraints serve as pivotal parameters that dictate the permissible ranges for production quantities, ensuring the Solver's adjustments lead to an optimal blend of products that aligns with resource availability and market demand constraints.

C$.$ Constraints act solely as historical benchmarks, obligating the Solver to mimic past production strategies to preserve consistency over time.

D$.$ Constraints are imposed to freeze the pricing structure of drugs, thereby insulating the model from the dynamic nature of market competition and price elasticity.

E$.$ Constraints are implemented to ascertain a predetermined quota of labor hours, independent of the actual resource limitations or raw material supply.