Name the structure in this illustration. 
Definitions:
Sensitivity Analysis
The study of how the variation in the output of a model can be attributed to variations in its inputs.
Optimal Solution
The best possible outcome or decision that maximizes or minimizes a specific objective, derived through analytical methods or mathematical optimization.
Feasible Region
In optimization problems, the set of all possible points that satisfy the problem's constraints, within which the optimal solution lies.
Valid Constraints
Restrictions or conditions in a mathematical model or optimization problem that are necessary for the formulation to accurately represent the real-world problem it seeks to solve.
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