Both IS-IS CSNPs and OSPF DD Packets Describe the Brief

Multiple Choice

Both IS-IS CSNPs and OSPF DD packets describe the brief information about link state databases in MA network. Which of the following statements regarding the two types of packets is true?

A) After CSNPs and DD packets are received by the peer router, the peer router needs to send an acknowledgement message; otherwise, the packets need to be retransmitted.
B) Once the neighbor relationship is established, CSNPs and DD packets are not sent.
C) The master/slave relationship in OSPF DD packet exchange is not bound to DR/BDR; and CSNPs are generated only by the DIS.
D) After CSNPs and DD packets are received by the peer router, the peer router does not need to send an acknowledgment message.