i got the answers wrong, what's the correct answer pls?

it is a question on toyota production system, the lean production & so on

Which answer correctly describes the production process concept that Taiichi Ohno applied to Just-in-Time? a. To ensure smooth assembly operation, parts must be procured while maintaining the sequence between the preceding process and the next process. b. The relationship between the preceding process and the next process is reversed, such that the next process goes to the preceding process to obtain parts: C. There is no relationship between the preceding process and the next process, and parts procurement is performed as needed, shorting the lead-time. d. To ensure good quality products, the production line is stopped immediately whenever a quality problem is detected in the product and cannot be fixed while the production line is running. Select the answer that correctly describes the "kanban" for which the Toyota Production System is famous for. a. It is an adaptation of the concept of production control cards used in the supermarket b. It is an ID card wom by an operator, indicating the work to be performed. c. It is similar to electronic signboards located inside plants, indicating the work being pertormed. d. It is the control chart meriod used to help identify when a process is out-of-control