Refer to the exhibit. 
Which statement about the OSPF debug output is true?
- A. The output displays OSPF hello messages which router R1 has sent or received on interface Fa0/1.
- B. The output displays all OSPF messages which router R1 has sent or received on all interfaces.
- C. The output displays all OSPF messages which router R1 has sent or received on interface Fa0/1.
- D. The output displays OSPF hello and LSACK messages which router R1 has sent or received.
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