Why does the theory of constraints advocate that a manager’s attention be directed to the bottleneck of a process? 

a. It is useful to lower the utilization of the bottleneck. 

b. The bottleneck has considerable influence on the average flow rate of a process. 

c. It is important to minimize the buffer inventory in front of the bottleneck. 

d. First-come-first-served scheduling of jobs at the bottleneck ensures that all jobs have the same expected waiting time before they are processed at the bottleneck.