Which of the following descriptions of the OSPF message is correct? (Multiple choice)
A . Negotiate the master-slave relationship in the ExStart state. After confirming the master-slave relationship, the master router sends DD packets, and the slave router cannot actively send DD packets, which can only respond to DD packets sent by the master router.
B . The Full status indicates that the LSDBs of the two routers have been synchronized.
C . In the Loading state, the routers send DD packets containing the summary of the link state information to describe the contents of the local LSD
E . The DD packet sent in the ExStart state contains the link state description.
Answer: AB