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