Question: In an MMS (Multimedia Messaging Service) architecture, what triggers the increment of the 'Number of Multimedia Messages read reply responses received by MMS Relay/Server' performance measurement counter?
Option 1: Sending of an MM4_read_reply.REQ message from the MMS Relay/Server to another MMS Relay/Server.
Option 2: Receipt of an 'MM4_read_reply.RES' message by the MMS Relay/Server from another MMS Relay/Server on the Reference point MM4.
Option 3: Successful delivery of a Multimedia Message to a User Equipment (UE).
Option 4: Failure to establish a connection over the Reference point MM4.
Explanation: This question requires understanding of the specific event that increments the counter for read reply responses in MMS performance management. The correct answer highlights the receipt of a response message (MM4_read_reply.RES) as the triggering event, demonstrating how the measurement tracks the server's interaction with other servers, crucial for monitoring and managing the efficiency of MMS relay/server operations in telecom networks.