In a Plant Location Problem with 5 Potential Locations, Each $X_{1}$

Multiple Choice

In a plant location problem with 5 potential locations, each with an associated 0-1 decision variable, $X_{1}$ , $\mathrm{X}_{2}, \mathrm{X}_{3}, \mathrm{X}_{4}$ , and $\mathrm{X}_{5}$ , which take a value of 1 if a plant is located in that location and 0 otherwise, the constraint to make sure that exactly 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) $X_{1}+X_{2}+X_{3}+X_{4}+X_{5}<3.0$