Question: Upon expiry of Timer T8 (Floor Revoke) in an MCPTT (Mission Critical Push To Talk) scenario, what action does the IWF (Interworking Function) Floor Control Server take regarding the 'U: pending Floor Revoke' state and the Floor Revoke message transmission?
Option 1: Immediately transitions out of the 'U: pending Floor Revoke' state without retransmitting the Floor Revoke message.
Option 2: Retransmits the Floor Revoke message with the same Rejection Cause field and Floor Indicator as before, restarts Timer T8, and remains in the 'U: pending Floor Revoke' state.
Option 3: Stops Timer T8 and moves to a new state without any further transmission of the Floor Revoke message until new input is received.
Option 4: Automatically disconnects the MCPTT client from the MCPTT call upon the first expiry of Timer T8.
Explanation: This correct answer reflects the specified behavior upon Timer T8 (Floor Revoke) expiry. The IWF Floor Control Server retransmits the Floor Revoke message (with unchanged fields), restarts the timer, and persists in the 'U: pending Floor Revoke' state to ensure continuous attempt to revoke floor access until successful or a limit is reached, maintaining call control integrity.