Question: What triggers the measurement of Successful Secondary Node Additions with SN terminated bearers in E-UTRAN?
Option 1: Receipt of RRCConnectionReconfigurationComplete message by MN from UE without path switch.
Option 2: Transmission by the MN of an SgNB reconfiguration complete message to SN after receiving RRCConnectionReconfigurationComplete message from UE with path switch.
Option 3: Inter-eNB Handover (HO) or intra-eNB HO.
Option 4: SN change.
Explanation: According to the provided text, the measurement of Successful Secondary Node Additions with SN terminated bearers is triggered when the MN transmits an SgNB reconfiguration complete message to SN after receiving RRCConnectionReconfigurationComplete message from UE with path switch. This is specified in point c) of the paragraph.