Consider four consecutive stages, A$,$ B$,$ C$,$ and D$.$

Each has the following capacity rates:

A: $12$ units$/$hr

B: $15$ units$/$hr

C: $11$ units$/$hr

D: $14$ units$/$hr

Assume the short$-$run peak demand on the system is $13$ units$/$hr$.$

Where would you add buffers to the system? Assume buffers are expensive. You don't want to add them unless they are necessary.

Choose ALL that apply. There may be more than one answer.

Group of answer choices

Before stage A

Between stage A and B

Between stage B and C

Between stage C and D

None of the above because you wouldn't need any buffers.