What information does a router running a link-state protocol use to build and maintain its topological database? (Choose two)

What information does a router running a link-state protocol use to build and maintain its topological database? (Choose two)
A . hello packets
B . SAP messages sent by other routers
C . LSAs from other routers
D . beacons received on point-to-point links
E . routing tables received from other link-state routers
F . TTL packets from designated routers

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Answer: AC