Which of the following most directly expresses the motivation behind the expression "Buffer or Suffer"?

A. To increase capacity, it is important to pool queues; otherwise the system will experience longer waiting times.

B. If there is variability in the arrival process or in processing times, ensure sufficient inventory exists between stages; otherwise flow rate will be reduced.

C. Variability in the service process reduces capacity more than variability in the arrival process.

D. It is important that machines are endowed with systems that avoid breakdowns (security buffers) in order to minimize down time.

E. Variability of inventory should be reduced by adding extra buffers in order to reduce waiting time.

Explain your answer.