题目内容
(请给出正确答案)
[单选题]
以下哪条信令消息可作为SgNB触发的PSCell站间变更准备成功的依据?()
A.SgNBChangeRequired
B.SgNBAdditionRequestAcknowledge
C.SgNBModificationRequestAcknowledge
D.SgNBModificationRequired
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