Question: Upon receiving a Floor Idle message from the floor control server arbitration logic, what action(s) does the MCPTT server's floor control interface towards the MCPTT client in the IWF (Interworking Function) perform?
Option 1: Forwards the Floor Idle message to the associated floor participant and remains in the 'U: not permitted and Floor Idle' state.
Option 2: Sets the first bit in the subtype of the Floor Idle message to '1' (Acknowledgment is required) without forwarding the message.
Option 3: Immediately transitions out of the 'U: not permitted and Floor Idle' state upon sending an acknowledgment.
Option 4: Waits for a Floor Ack message before forwarding the Floor Idle message to the associated floor participant.
Explanation: Upon receiving a Floor Idle message, the MCPTT server's floor control interface must forward this message to the relevant participant and stay in the 'U: not permitted and Floor Idle' state. This ensures that the floor status is correctly communicated to all participants while maintaining the current permission state.