Question: In an MMS (Multimedia Messaging Service) architecture, where is the 'MM1_submit.RES' message transmitted to, as per the measurement for the Number of Multimedia Messages submit responses sent by MMS Relay/Server?
Option 1: MMS User Agent on the Reference point MM1
Option 2: MMS Relay/Server Function for further processing
Option 3: GSM/UMTS Network Switching Center
Option 4: External Multimedia Server
Explanation: The 'MM1_submit.RES' message is sent by the MMS Relay/Server to the MMS User Agent on the Reference point MM1, as part of the message submission process. This highlights the interaction between these components in managing multimedia message submissions within a telecom network.