Question: What is the typical response sent back to the Mobile Station after receiving an incoming RP-DATA or RP-SMMA in a Point-to-Point Short Message Service (SMS) over the mobile radio interface?
Option 1: CP-DATA message with new user information
Option 2: Either RP-ACK (acknowledgement) or RP-ERROR (error indication)
Option 3: MNSMS-DATA-Request for retransmission
Option 4: SMC entity's lower layer service response
Explanation: In the context of SMS over the mobile radio interface, upon receiving an incoming RP-DATA or RP-SMMA, the typical procedure involves responding with either an acknowledgement (RP-ACK) if the message is successfully processed or an error indication (RP-ERROR) if there's a problem. This ensures reliable communication and informs the sender about the outcome of the message delivery.