【单选题】
A The output displays OSPF hello messages which router R1 has sent or received on interface Fa0/1.
B The output displays OSPF messages which router R1 has sent or received on all interfaces.
C The output displays 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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