When a router running OSPF receives an LSA, and the LSA does not exist in its link state database, how will the router handle this LSA?

When a router running OSPF receives an LSA, and the LSA does not exist in its link state database, how will the router handle this LSA?
A . The router will silently discard this LSA without returning any messages.
B . This LSA will be flooded to other OSPF neighbors immediately.
C . The LSA will be installed in its own link state database, and then the LSA will be confirmed through multicast.
D . Check the Age of the LSA to see if it has expired.

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Answer: D