Question: Which of the following is NOT a primary mechanism for triggering service announcements by the BM-SC (Broadcast Multicast Service Centre) for MBMS (Multimedia Broadcast/Multicast Service) user services?
Option 1: PUSH mechanism (WAP push)
Option 2: SMS-CB (Cell Broadcast)
Option 3: UE (User Equipment) Request via Dedicated Signaling
Option 4: URL (WAP, HTTP)
Explanation: According to the standards for MBMS, primary mechanisms for service announcements include PUSH mechanism, URL, SMS, and SMS-CB. There is no mention of UE requests via dedicated signaling as a standard mechanism for triggering service announcements by the BM-SC.