A community center is purchasing folding chairs and folding tables for a fundraiser. Because of limited storage space, the total volume of the shipment must be no more than 120 cubic feet. Each chair occupies 4.5 cubic feet of space, and each table occupies 12 cubic feet of space.
For every table purchased, the center wants at least 3 chairs so that there will be enough seating.
Let c be the number of chairs and t be the number of tables, where c and t are non-negative integers.
Which of the following systems of inequalities best represents this situation?