A.The configuration has not been completed yet on the router
B.There is only one entry and exit path to the service provider，so one static route is sufficient
C.The LAN functions at L3， so dynamic routing does not need to be enabled
D.Switch Agg 1 and R1 have not achieved L3 adjacency yet，thus whatever routing protocol has been configuration on R1 is not completely up
E.There is only one L3 device，thus dynamic routing is not needed