Question: In which of the following scenarios is an update-event with new location elements **NOT** generated for Tracking Area/EPS Location Update?
Option 1: During an X2 based handover
Option 2: When a UE triggers a Service Request
Option 3: Upon successful attachment to a Wi-Fi network (not involving E-UTRAN)
Option 4: In case of an S1 based handover
Explanation: The generation of an update-event with new location elements for Tracking Area/EPS Location Update is specified for scenarios involving E-UTRAN access. Attaching to a Wi-Fi network (not involving E-UTRAN) does not trigger these specific update-events, as the context focuses on Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access scenarios.