Question: In an MBMS Consumption Report Request message, what is the primary purpose of the `reportClientId` attribute when set to "1" or "true"?
Option 1: To enable the BM-SC to correlate start and stop consumption reports from individual UEs.
Option 2: To indicate a change in the UE's location while consuming the MBMS User Service.
Option 3: To specify the MIME Type for the document in the request.
Option 4: To declare the transition of UE consumption from unicast to MBMS bearer.
Explanation: The `reportClientId` attribute, when set to "1" or "true", allows the Broadcast Multicast Service Centre (BM-SC) to correlate the start and stop consumption reports from individual User Equipment (UEs), enhancing the reporting granularity and accuracy for service consumption tracking. This is crucial for precise audience measurement and service optimization in MBMS deployments.