Question: Upon receiving a Floor Queue Position Info message from the floor control server interface, what actions does the floor participant interface toward the MCPTT client take if the first bit in the subtype requires acknowledgement?
Option 1: It only sends the Floor Queue Position Info message to the MCPTT floor participant and changes state to 'P: has permission'.
Option 2: It sends the Floor Queue Position Info message to the MCPTT floor participant but does not store any indication regarding acknowledgements.
Option 3: It stores an indication for a Floor Ack message but does not forward the Floor Queue Position Info message to the MCPTT floor participant.
Option 4: It sends the Floor Queue Position Info message to the MCPTT floor participant, stores an indication that a Floor Ack message is expected (if acknowledgement is required), and remains in the 'P: has no permission' state.
Explanation: This correct answer reflects the precise sequence of actions outlined for the scenario where acknowledgement is required (indicated by the first bit in the subtype being set to '1'). It correctly combines all specified actions: forwarding the message, tracking the need for acknowledgement, and maintaining a specific state ('P: has no permission'), demonstrating a nuanced understanding of MCPTT media plane control interworking with LMR systems as per 3GPP specifications.