Some Resources (I

Multiple Choice

Some resources (i.e. meat and dairy products, pharmaceuticals, a can of paint) are perishable. This means that once a package (e.g. a can or a bag) is open the content should be used in its entirety. Which of the following constraints reflects this fact?

A) f(X₁, X₂, X₃, X₄) ≤ b₁
B) f(X₁, X₂, X₃, X₄) ≥ b₁
C) f(X₁, X₂, X₃, X₄) = b₁
D) f(X₁, X₂, X₃, X₄) ≠ b₁