Question: In IMS group management, what is the primary reference point used for managing groups from the User Equipment (UE: User Equipment) perspective?
Option 1: N12 Reference Point (between UE and OSA/Parlay Gateway)
Option 2: Sh Reference Point (between AS and HSS)
Option 3: Ut Reference Point (between UE and Application Server)
Option 4: Cx Reference Point (between I-CSCF and HSS)
Explanation: The Ut reference point is specifically utilized for direct communication between the User Equipment (UE) and an Application Server (AS), enabling the UE to manage groups directly with the server responsible for group management, which may also be referred to as a Group and List Management Server (GLMS). This aligns with the requirement for managing IMS groups from the UE's perspective.