单项选择题

An administrator runs mktcpip aixhost 172.168.0.50 enO ……

An administrator runs mktcpip aixhost 172.168.0.50 enO to change the network address， but the command hangs for an extended period of time.
Which of the following is the most likely cause of the problem（）

A.entO is in a defined state
B.enO is currently active
C.There is no physical network adapter on the system
D.The address 172.168.0.50 is in use by another system

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