Question: In an MCPTT (Mission Critical Push To Talk) system interworking with LMR (Land Mobile Radio), when transitioning into the 'U: not permitted and Floor Idle' state, what actions are taken by the IWF (InterWorking Function) floor control server towards the MCPTT client?
Option 1: The IWF floor control server updates the Track Info field in storage and sets the floor participant state to 'Granted'.
Option 2: The IWF floor control server ignores any stored Track Info field and maintains the current floor participant state.
Option 3: The IWF floor control server removes any stored Track Info field and sets the associated floor participant state to 'U: not permitted and Floor Idle'.
Option 4: The IWF floor control server sends a request for a new Track Info field and puts the floor participant in a 'Pending' state.
Explanation: This is correct because, when entering the 'U: not permitted and Floor Idle' state, the IWF floor control server must remove any stored Track Info field to ensure alignment with the new state, indicating no active tracking, and update the associated floor participant state to reflect they are not permitted to access the floor and it is currently idle, preventing potential conflicts or misunderstandings about access rights.