The OSPF protocol is running on a company network. To understand the OSPF mechanism to perform packet capture operations on the network, which of the following description about the OSPF packet is correct? (Multiple Choice)

The OSPF protocol is running on a company network. To understand the OSPF mechanism to perform packet capture operations on the network, which of the following description about the OSPF packet is correct? (Multiple Choice)
A . LS Update message synchronizes the link state database by sending detailed LSA information.
B . After receiving the LS Update message, the router must send LS Ack to confirm.
C . Sending Hello packets immediately after the interface joins the OSPF area.
D . The LS Update message is sent only when the adjacency is established.

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Answer: AC