3 questions on "OSPF Database Exchange - Requesting, Getting, and Acknowledging LSAs"

What kind of packet do the routers use the request one or more LSA's from its neighbor?
LSR (Link state Request)
What kind of packet do the routers use to respond to a LSR and what does it consist?
LSU (Link-state Update)

One or more full LSAs.
What methods can be used to acknowledge an LSU?
-Repeating same LSU
-Send back an LSAck (contains list of ack LSA headers).
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