Question: What is implied upon receipt of an MNSMS-ESTablish-INDication by the SMC entity in a mobile radio interface, specifically for Point-to-Point Short Message Service (SMS)?
Option 1: Initiation of a new RPDU transmission to the SM-user.
Option 2: Completion of the establishment of the CM-connection for the SMR entity.
Option 3: Termination of an existing CP-DATA message exchange.
Option 4: Request for additional SM-user information from SM-RL.
Explanation: The correct answer is directly implied by the MNSMS-ESTablish-INDication's purpose. This indication signifies that the setup of the necessary connection (CM-connection) for this Short Message Service Relay (SMR) entity is now complete, ensuring the pathway for SMS transmission is established.