Kanban is a term used to indicate some type of visual signal in the replenishment process. which statement best describes the use of kanban in reducing inventories in a just-in-time type of operation? a. an operator asks the next station's operator to him fix his machine. b. a supervisor signals to several work centers that the production rate should be changed. c. a "supplier" work center signals the downstream workstation that a batch has been completed. d. a "customer" work center signals to the "supplier" workstation that more parts are needed. e. a supervisor tells the operators to stay busy and start producing parts for next month.