Question: In a Point-to-Point Short Message Service (SMS) scenario, when an SMR entity in the network is in the 'Wait to Send RP-ACK' state and receives an error indication from the CM-sublayer, what actions are taken by the SMR entity?
Option 1: The SMR entity generates an RP-ERROR message and relays it to the MS, then enters the Idle state.
Option 2: The SMR entity resets timer TR2N, passes a CM-connection release request to the CM-sublayer, and remains in the 'Wait to Send RP-ACK' state.
Option 3: The SMR entity resets timer TR2N, passes a report indication to the SM-TL, and enters the Idle state.
Option 4: The SMR entity ignores the error indication and waits for further instructions from the CM-sublayer.
Explanation: When the SMR entity in the network is in the 'Wait to Send RP-ACK' state and receives an error indication from the CM-sublayer, the correct sequence of actions involves resetting timer TR2N to prevent unnecessary timeouts, passing a report indication to the SM-TL to notify about the error, and then transitioning into the Idle state. This ensures that resources are released appropriately and the system is notified of the error for potential further action or logging.