Question: In the context of Point-to-Point Short Message Service (SMS) over mobile radio interface, what happens when the timer TC1* expires after the maximum number of CP-DATA message retransmission attempts in the Wait for CP-ACK state?
Option 1: The SMC entity resets the timer TC1* and remains in the Wait for CP-ACK state.
Option 2: The SMC entity sends a CP-ERROR message but continues to wait for a CP-ACK.
Option 3: The SMC entity re-enters the MM-Connection Pending state to restart the process.
Option 4: An error indication is passed to SM-RL, an MM-connection release request is sent to the MM-sublayer, and the Idle state is entered.
Explanation: According to specified behavior for SMS over mobile radio interface, if the timer TC1* expires after maximum allowed CP-DATA message retransmissions in the Wait for CP-ACK state, the Short Message Control (SMC) entity indicates an error to SM-RL, releases the Mobile Management (MM) connection, and enters the Idle state, ensuring resource cleanup and state consistency in case of persistent transmission failures.