Question: Upon receiving a Floor Idle message from the floor control server arbitration logic, what action does the IWF (Interworking Function) floor control server take if an indication for dual floor control is stored for a participant?
Option 1: Immediately enter the 'U: not permitted and Floor Idle' state and remove all stored indications.
Option 2: Remain in the 'U: not permitted and Floor Taken' state and then remove the dual floor control indication.
Option 3: Send an additional Floor Ack message to the participant before taking any state transition actions.
Option 4: Ignore the Floor Idle message until a Floor Ack message is received from the participant.
Explanation: According to the specified behavior for handling a Floor Idle message when dual floor control is applied, the IWF floor control server shall remain in the 'U: not permitted and Floor Taken' state and then remove the indication of dual floor control. This ensures a controlled transition out of the dual floor control scenario while maintaining the integrity of the floor control states.