Question: Upon receiving a Floor Taken message from the floor control arbitration logic in the Interworking Function (IWF), what action is mandatory for the floor control interface towards the Mission Critical Push To Talk (MCPTT) client regarding the handling of this message?
Option 1: Ignore the message if no participant is associated.
Option 2: Forward the Floor Taken message to the associated floor participant.
Option 3: Always set the first bit in the subtype to '0' (Acknowledgment not required).
Option 4: Immediately enter the state 'U: permitted and Floor Released'.
Explanation: According to the specified procedure for handling a received Floor Taken message, the floor control interface must ensure that the message is properly directed to the relevant party. This involves forwarding the message to the participant associated with the floor, ensuring seamless communication and floor control management in MCPTT operations with LMR systems.