Question: What is a prerequisite for performing Short Message Relay Layer (SM-RL) procedures, as described in the context of Point-to-Point Short Message Service (SMS) support?
Option 1: Establishment of multiple parallel transactions between SMR entities.
Option 2: A CM-connection established between the mobile station (UE: User Equipment) and the network.
Option 3: Completion of a previous short message transaction on the same SMR entity.
Option 4: Activation of the Short Message Service (SMS) feature on the mobile station.
Explanation: The correct answer highlights that for any SM-RL procedure to be initiated or performed, a Connection Management (CM) connection must first be set up between the mobile device and the network infrastructure, serving as the foundational link enabling communication between SMR entities.