can someone pls help me answer this, will give a like

Which one of the following scenarios represents the use of a kanban to reduce inventories? An operator asks the next station's operator to help him fix his machine. A "customer" work centre signals to the "supplier" workstation that more parts are needed. A supervisor signals to several work centres that the production rate should be changed. A "supplier" work centre signals the downstream workstation that a batch has been completed. A supervisor tells the operators to stay busy and start producing parts for next month