Which of the following statements regarding routed and routing protocols are true?（）

• A、A routed protocol is assigned to an interface and determines the method of packet deliver.
• B、A routing protocol determines the path of a packet through a network.
• C、A routed protocol determines the path of a packet through a network.
• D、A routing protocol operates at the transport layer of the OSI model.
• E、A routed protocol updates the routing table of a router.