Question: What triggers the counting of E-RABs attempted to release, and what is the condition for a repeated E-RAB not being counted again?
Option 1: Receipt by the eNodeB/RN of an E-RAB RELEASE COMMAND or UE CONTEXT RELEASE COMMAND or RESET message from MME/DeNB, with each corresponding E-RAB counted multiple times if it appears in different messages.
Option 2: Receipt by the eNodeB/RN of an E-RAB RELEASE COMMAND or UE CONTEXT RELEASE COMMAND or RESET message from MME/DeNB, with the same E-RAB not being counted repeatedly but only once even if it appears more than one time in the same or different messages triggering this measurement.
Option 3: Transmission by the eNodeB/RN of an E-RAB Release Indication or RESET message to MME/DeNB, with each corresponding E-RAB counted multiple times if it appears in different messages.
Option 4: Receipt by the eNB/RN of a PATH SWITCH REQUEST ACKNOWLEDGE or PATH SWITCH REQUEST FAILED message, with the same E-RAB being counted repeatedly for each message.
Explanation: According to the text, the counting of E-RABs attempted to release is triggered by specific messages received or sent by the eNodeB/RN. The correct option states that the same E-RAB shall not be counted repeatedly but only once even if it appears more than one time in the same or different messages triggering this measurement. This ensures accurate counting and avoids double-counting of E-RABs.