Question: What triggers the counting of an attempted outgoing Packet Switched inter-RAT handover in a UTRAN-controlled scenario?
Option 1: Successful completion of the handover to the target RAT (Radio Access Technology)
Option 2: Receipt of a Handover Request Acknowledge from the target system
Option 3: Transmission of a RRC-message, CELL CHANGE ORDER FROM UTRAN, from source RNC to the UE
Option 4: Initiation of the handover procedure by the UE due to poor signal strength
Explanation: The correct trigger for counting an attempted outgoing Packet Switched inter-RAT handover in a UTRAN-controlled scenario is the transmission of a specific RRC (Radio Resource Control) message, namely 'CELL CHANGE ORDER FROM UTRAN', from the source RNC to the UE. This message indicates the network's attempt to hand over the UE to another RAT.