In a Plant Location Problem with 5 Potential Locations, Each $0-1$

Multiple Choice

In a plant location problem with 5 potential locations, each with an associated $0-1$ decision variable, $X_{1}$ , $X_{2}, X_{3}, X_{4}$ ,and $X_{5}$ , which take a value of 1 if a plant is located in that location and 0 otherwise, the constraint to make sure that at most 3 plants are put up will be

A) $X_{1}+X_{2}+X_{3}+X_{4}+X_{5}>3.0$
B) $X_{1}+X_{2}+X_{3}+X_{4}+X_{5} \geq 3.0$
C) $X_{1}+X_{2}+X_{3}+X_{4}+X_{5}=3.0$
D) $X_{1}+X_{2}+X_{3}+X_{4}+X_{5} \leq 3.0$
E) $X_{1}+X_{2}+X_{3}+X_{4}+X_{5}<3.0$