In the$$ Drum$-$Buffer$-$Rope scheduling$$ system:

A$.$

$$Non$-$bottleneck resources cannot overproduce relative to the throughput rate at the bottleneck.

B$.$

The system$$ drumbeat, or pace of$$ work, is set by the bottleneck schedule.

C$.$

All other responses are correct.

D$.$

The$$ "rope" represents communication regarding throughput at the bottleneck that is used to prevent releasing jobs that the bottleneck workcenter will not be able to handle.

E$.$

The$$ "buffer" is extra time which is needed to ensure that the bottleneck is never starved for work due to disruptions at upstream workstations.