Which one of the following items about Theory of Constraints is TRUE?
a. Operating processes close to their capacity can result in low customer satisfaction and even losing money despite high sales levels.
b. According to the Theory of Constraints, the four operational measures include inventory, throughput, delivery lead times and utilization.
c. Any system composed of resources that are operating at maximum output will, by definition, have maximum output for the entire system.
d. In a shop managed according to TOC principles, inventory is needed only in front of non-bottlenecks in order to prevent them from sitting idle.