The process batch at the constraint in a$$ drum$-$buffer$-$rope system should$$ be:

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Part $1$

A$.$

of such a size as to maximize the number of setups for the constraint

B$.$

the same size as the transfer batch.

C$.$

of such a size as to improve utilization of the constraint.

D$.$

the same size as that at any$$ non$-$constraint.