【单选题】
A 可能是SMF上未配置对应的TACNR
Possibly, the corresponding TACNR is not configured on the SMF.
B 可能是SMF上配置了TACNR但未绑定UPF
Possibly, the TACNR is configured on the SMF but the UPF is not bound.
C 可能是用户请求的DNN未绑定UPF
Possibly, the DNN requested by the user is not bound to the UPF.
D 可能是NRF未查询到指定UPF
Possibly, the NRF fails to find the specified UPF.
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