Question: In an IP Multimedia Subsystem (IMS) supporting Inter-UE Transfer, which of the following roles can **any** IMS User Equipment (UE) assume?
Option 1: Controller UE exclusively
Option 2: Controllee UE exclusively
Option 3: Either Controller UE or Controllee UE
Option 4: Neither Controller UE nor Controllee UE
Explanation: According to IMS Service Continuity principles, any IMS UE can initiate procedures (Controller UE role) or respond to actions (Controllee UE role), depending on the scenario, indicating flexibility in assuming either role.