Question: Upon receiving a Floor Granted message from the floor control arbitration logic, what actions are mandated for the floor control interface towards the MCPTT (Mission Critical Push To Talk) client?
Option 1: Only forward the Floor Granted messages to the associated floor participant.
Option 2: Set the first bit in the subtype of the Floor Granted message to '1' (Acknowledgment is required) and enter the state 'U: permitted'.
Option 3: Enter the state 'U: permitted' without forwarding the Floor Granted message.
Option 4: Forward the Floor Granted messages to the associated floor participant and shall enter the state 'U: permitted', with the option to set the first bit in the subtype for acknowledgment.
Explanation: This correct answer reflects the full scope of mandated actions as per the specification. The interface must forward the message (ensuring communication) and change its state to 'U: permitted' (indicating a status update). While setting the first bit for acknowledgment is mentioned as an option in the specification, the two definitive actions (forwarding the message and changing the state) are accurately captured in Option 4, making it the most comprehensive choice.