【单选题】
A DNS未配置解析数据
The DNS is not configured with resolution data.
B 解析MME地址失败
The MME address fails to be resolved.
C 局间切换源AMF通过NRF发现目标局时等待NRF响应超时
Timeout occurs in waiting for the NRF response when the source AMF discovers the target AMF through the NRF during inter-AMF switching.
D N26接口故障
N26 interface fault
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