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)
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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.
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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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