【单选题】
下列（？ ）过程不是NB-IoT连接挂起过程中的步骤。
A. RRC连接挂起
B. 释放接入承载响应
C. S1-AP：UE上下文挂起响应
D. 初始向下文响应
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答案
D
解析
暂无解析
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