Question: In an MCPTT (Mission Critical Push To Talk) system, when the IWF (InterWorking Function) floor control server enters the 'G: Floor Taken' state, what action is taken regarding the `Permission to Request the Floor` field in the `Floor Taken` message for a non-broadcast group call?
Option 1: The field is always set to '0', preventing any further floor requests.
Option 2: The field is always set to '1', allowing other participants to request the floor.
Option 3: The field's value depends on the priority of the granted user's MCPTT ID.
Option 4: The field may be included and set to '1', but its inclusion is optional.
Explanation: According to the specifications, when entering the 'G: Floor Taken' state in an MCPTT system for a non-broadcast group call, the `Floor Taken` message may include the Permission to Request the Floor field set to '1', indicating flexibility in whether to include this field and allow further floor requests.