After learning about Toyota Production System $($TPS$),$ you plan to implement heijunka at a production facility. Which of the following tasks should be your top priority?

After learning about Toyota Production System $($TPS$),$ you plan to implement heijunka at a production facility. Which of the following tasks should be your top priority?

Reduce the number of kanban cards.

Reduce setup and changeover times at the different stations.

Encourage feedback among workers so as to introduce kaizen teams.

Increase the storage space for finished products.