Question: Upon receiving a Floor Taken message with the G-bit set to '1' (Dual floor) from the floor control arbitration logic, what action(s) does the IWF floor control server take towards the MCPTT client?
Option 1: Only forwards the Floor Taken message to the associated floor participant.
Option 2: Sets the first bit in the subtype of the Floor Taken message to '1' (Acknowledgment is required) but does not forward the message.
Option 3: Forwards the Floor Taken message and stores an indication that the participant is listening to media from two sources, without requesting acknowledgment.
Option 4: Forwards the Floor Taken message, may set the first bit in the subtype to '1' (Acknowledgment is required), stores an indication of dual media source listening, and remains in the 'U: not permitted and Floor Taken' state.
Explanation: This option correctly combines all specified actions for the IWF floor control server when handling a Dual floor scenario: forwarding the message, optionally setting the acknowledgment bit, storing an indication of dual media source listening, and remaining in the 'U: not permitted and Floor Taken' state.