After the administrator successfully logs in to the router through Telnet, and finds that the router’s interface IP address cannot be allocated, the possible reasons are ()

After the administrator successfully logs in to the router through Telnet, and finds that the router’s interface IP address cannot be allocated, the possible reasons are ()
A . The Telnet user level is incorrectly configured
B . SNMP parameter is incorrectly configured
C . The Telnet user authentication mode is incorrectly configured
D . The administrator uses the telnet terminal software to prohibit the corresponding operation

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Answer: A