Question: Upon receiving a Floor Deny message from the floor control server interface that requires acknowledgement, what actions does the floor participant interface undertake toward the MCPTT client?
Option 1: It only sends the Floor Deny message to the MCPTT floor participant and changes state to 'P: has permission'.
Option 2: It sends the Floor Deny message to the MCPTT floor participant but does not store any indication regarding a Floor Ack message.
Option 3: It stores an indication for a Floor Ack message but does not forward the Floor Deny message to the MCPTT floor participant.
Option 4: It sends the Floor Deny message to the MCPTT floor participant, stores an indication that a Floor Ack message is expected due to the acknowledgement requirement, and remains in the 'P: has no permission' state.
Explanation: This correct answer reflects the precise sequence of actions for the scenario where acknowledgement is required. It correctly identifies forwarding the message, anticipating and recording the need for a Floor Ack response, and maintaining the 'P: has no permission' state, aligning with both acknowledgement protocol and state management requirements.