Consider the adjacent work stations in this two card Kanban system. Work Center $3$ has just pulled the Incoming Parts C box to their work station. What happens to the cards in the Incoming Parts C box and at the work$$ station?

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Part $1$

A$.$

The move card at their station goes in the Incoming Parts C box and the production card is pulled from the Incoming Parts C box to signal the worker at Work Center $2$ that there is a need to produce material.

B$.$

The production card at their station goes in the Incoming Parts C box and the move card is pulled from the Incoming Parts C box to signal the worker at Work Center $2$ that there is a need to move material.

C$.$

The move card at their station goes in the box they will send downstream to Work Center $4$ and the production card is placed at the Work Center $3$ station while they are working on this batch of material.

D$.$

The production card at the station is passed back to Work Center $2$ as a signal to produce more material and the move card is left at Work Center $3$ to signal that they are ready to accept materials when they are complete at Work Center $2.$