单选题An administrator types in the command router ospf 1 and receives the er ror message: "OSPF process 1 cannot start." (Output is omitted.) What should be done to correctly set up OSPF？（）AEnsure that an interface has been configured with an IP addressBEnsure that IP classless is enabledCEnsure that the interfaces can ping their directly connected neighborsDEnsure that an interface has been configured with an IP address and is up
单选题
An administrator types in the command router ospf 1 and receives the er ror message: "OSPF process 1 cannot start." (Output is omitted.) What should be done to correctly set up OSPF？（）
A
Ensure that an interface has been configured with an IP address
B
Ensure that IP classless is enabled
C
Ensure that the interfaces can ping their directly connected neighbors
D
Ensure that an interface has been configured with an IP address and is up
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