Question: Upon entering the 'U: not permitted and Floor Taken' state, what action does the Interworking Function (IWF) floor control server take regarding a stored Track Info field in an MCPTT-LMR interworking scenario?
Option 1: The IWF floor control server updates the Track Info field with the new state indication.
Option 2: The IWF floor control server removes the Track Info field from storage.
Option 3: The IWF floor control server ignores the stored Track Info field and only updates its internal state.
Option 4: The IWF floor control server sends the stored Track Info field to all connected LMR devices.
Explanation: When transitioning into the 'U: not permitted and Floor Taken' state, the IWF floor control server must remove any stored Track Info field. This ensures synchronization and prevents outdated information from being retained, which is crucial for maintaining orderly communication flow in Mission Critical Push To Talk (MCPTT) interworking with Land Mobile Radio (LMR) systems.