When a route receives an LSA (within an LSU), it does not do which of the following?
Select the best response.

A.
if the LSA entry does not already exist,the router adds the entry to its LSDB, sends back
an LSAck, floods the information to other routes,runs SPF,and updates its routing table.

B.
if the entry already exists and the received LSA has the same sequence number, the
router overwrites the information in the LSDB with the new LSA entry.

C.
if the entry already exists but the LSA includes newer information (it has a higher
sequence number), the router adds the entry to its LSDB, sends back an LSAck, floods
the information to other routers, runs SPF, and updates its routing table.

D.
if the entry alteady exists but the LSA includes older information, it sends an LSU to the
sender with its newer information.