What is the order of packet types used by an OSPF router to establish convergence?

Question:
What is the order of packet types used by an OSPF router to establish convergence?

• Hello, LSAck, LSU, LSR, DBD
• LSAck, Hello, DBD, LSU, LSR
• Hello, DBD, LSR, LSU, LSAck
• LSU, LSAck, Hello, DBD, LSR

Explanation: An OSPF router progresses in this order to convergence, using the following packets:
1. Hello packet, used for OSPF election and establishing neighbor adjacencies
2. DBD packet, used to synchronize databases with neighbors
3. LSR packet, used to request more information in synchronizing databases
4. LSU packet, used to send link-state updates to neighbors
5. LSAck packet, used to acknowledge receipt of an LSU

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