Question: Which of the following functions is NOT applicable to all architectures on the M3 interface, as per its defined roles?
Option 1: MBMS Session Handling Function
Option 2: M3 Interface Management Function
Option 3: M3 Configuration Function
Option 4: Error Indication
Explanation: The M3 Configuration Function is specifically applicable only in a distributed MCE (Multi-Cell/Multicast Coordination Entity) architecture, implying not all architectures utilizing the M3 interface will employ this function. In contrast, MBMS Session Handling and M3 Interface Management Functions are broadly applicable, and Error Indication relates to the latter, suggesting their relevance across various architectures.