SN添加统计指的是()
（A）从MN发起B1测量到MN收到E-RAB Modification Confirm
（B）从MN发起SgNB Addition Request到MN收到E-RAB Modification Confirm
（C）从NN发起SgNB Addition Request到MN收到SgNB Addition Request Acknowledge
（D）从MN发起B1测量到MN收到SgNB Addition Request Acknowledge
参考答案
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