Question: What triggers the increment of an RRC connection establishment attempt measurement for a specific cause?
Option 1: Receipt of an RRCConnectionRelease message by the eNodeB/RN from the UE.
Option 2: Receipt of an RRCConnectionRequest message by the eNodeB/RN from the UE.
Option 3: Transmission of an RRCConnectionSetup message by the eNodeB/RN to the UE.
Option 4: Establishment of a successful RRC connection.
Explanation: According to the specifications, each RRCConnectionRequest message received by the eNodeB/RN from the UE is added to the relevant per establishment cause measurement. This indicates that the receipt of an RRCConnectionRequest message triggers the increment of an RRC connection establishment attempt measurement for a specific cause.