A router receives an OSPF database description packet from a neighbor that references an LSA, which is already in the router's LSDB.The sequence number in the DBD packet is lower than the sequence number of the LSA in the LSDB. What action does the router take?

A router receives an OSPF database description packet from a neighbor that references an LSA, which is already in the router's LSDB.The sequence number in the DBD packet is lower than the sequence number of the LSA in the LSDB. What action does the router take?
A . The router sends a link-state update to its neighbor.
B . The router sends a link-state acknowledgement to its neighbor.
C . The router updates the information in its LSDB with the information received from its neighbor.
D . The router sends a link-state request to its neighbor.
E . The router takes no action.

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Answer: A