Consider the Constraint X₃ + X₄ + X₅ + X₆ $\ge$

Consider the constraint X₃ + X₄ + X₅ + X₆ + X₇ $\ge$ 27
Representing Air Express' Monday minimum worker requirement. Why was a " $\ge$ " used versus an "="?

A) The " $\ge$ " is needed to accommodate workers held over from Sunday.
B) Solver only accepts " $\ge$ " constraints.
C) The " $\ge$ " is less restrictive.
D) The "=" will always produce an infeasible constraint.